Thursday 31 May 2012

Secular Café: FAIL

Secular Café
Serious discussion of science, skepticism, evolution, pseudoscience, and the paranormal
FAIL
May 31st 2012, 16:56

link

Quote:

Why, if the theory of natural selection is true haven't deer evolved so they know to stay off the highway?
:bang:

You are receiving this email because you subscribed to this feed at blogtrottr.com.

If you no longer wish to receive these emails, you can unsubscribe from this feed, or manage all your subscriptions

Secular Café: Virgin Galactic gets Okay for Space Ship 2

Secular Café
Serious discussion of science, skepticism, evolution, pseudoscience, and the paranormal
Virgin Galactic gets Okay for Space Ship 2
May 31st 2012, 12:54

Quote:

Richard Branson gets nod to strap rocket on SpaceShipTwo

By Brid-Aine Parnell

The millionaire transporter has got an experimental launch permit from the US Federal Aviation Administration for the ship and its carrier aircraft, the WhiteKnightTwo, the space biz announced.

The pair have already done some flying together but haven't done any rocket-powered flight yet.

The WhiteKnightTwo has done 80 test flights and the SS2 has been up 16 times, including three tests that checked out the craft's re-entry system. Virgin have also fired the tyre-rubber-and-laughing-gas-powered rocket in 10 tests, successfully completing full duration burns, but this is the first time they'll be strapping it on the SS2 for a test fire.

Scaled Composites, the spacecraft builder, will fly the SS2 a couple of more times with the unlit rocket aboard to ensure the ship works well with the extra weight. In the meantime, integration of the rocket's components through the summer before a full blasting flight expected towards the end of the year.
...
http://www.theregister.co.uk/2012/05...ht_permission/

You are receiving this email because you subscribed to this feed at blogtrottr.com.

If you no longer wish to receive these emails, you can unsubscribe from this feed, or manage all your subscriptions

Secular Café: Speedy super-eruptions of super-volcanoes

Secular Café
Serious discussion of science, skepticism, evolution, pseudoscience, and the paranormal
Speedy super-eruptions of super-volcanoes
May 31st 2012, 08:38

So, what lurks beneath?

Quote:

The largest volcanoes on our planet may take as little as a few hundred years to form and erupt.

These "supervolcanoes" were thought to exist for as much as 200,000 years before releasing their vast underground pools of molten rock.

Researchers reporting in Plos One have sampled the rock at the supervolcano site of Long Valley in California.

Their findings suggest that the magma pool beneath it erupted within as little as hundreds of years of forming.
Quote:

"Our study [of crystal formation] suggests that when these exceptionally large magma pools form they are ephemeral and cannot exist very long without erupting," said Dr Gualda.

"The fact that the process of magma body formation occurs in historical time, instead of geological time, completely changes the nature of the problem."

At present, geologists do not believe that any of Earth's known giant magma pools are in imminent danger of eruption, ....
Phew!

Quote:

.... but the results suggest future work to better understand how the pools develop, and aim ultimately to predict devastating super-eruptions.

You are receiving this email because you subscribed to this feed at blogtrottr.com.

If you no longer wish to receive these emails, you can unsubscribe from this feed, or manage all your subscriptions

Wednesday 30 May 2012

Secular Café: SpaceX signs new contract to launch Satellite

Secular Café
Serious discussion of science, skepticism, evolution, pseudoscience, and the paranormal
SpaceX signs new contract to launch Satellite
May 30th 2012, 14:47

with the worlds most powerful rocket yet.


Quote:

Space Exploration Technologies (SpaceX), which designs and launches rockets as well as spacecraft, said on Tuesday it signed the first commercial contract to launch the world's most powerful rocket.

The Falcon Heavy rocket will launch a communications satellite into geosynchronous orbit (a circular orbit around the Earth nearly 24 hours long) for satellite services company Intelsat, according to a press release. Financial terms of the agreement were not disclosed.

'SpaceX is very proud to have the confidence of Intelsat.'

- Elon Musk

"SpaceX is very proud to have the confidence of Intelsat, a leader in the satellite communication services industry," said Elon Musk, SpaceX CEO and chief designer, in a statement. "The Falcon Heavy has more than twice the power of the next largest rocket in the world. With this new vehicle, SpaceX launch systems now cover the entire spectrum of the launch needs for commercial, civil and national security customers."

Capable of lifting 117,000 pounds to low Earth orbit and over 26,000 pounds to geosynchronous orbit, the Falcon Heavy is the most powerful rocket in the world, the company said.

Intelsat, which operates the world's largest satellite fleet, praised the advanced vehicle, which they said provides them with expanded opportunities.

Read more: http://www.foxnews.com/scitech/2012/...#ixzz1wMeqP5fD
....
http://www.foxnews.com/scitech/2012/...werful-rocket/


P.S. I have to believe the Saturn 5 (moon rocket) was more powerful, but I guess it is not currently in production..

You are receiving this email because you subscribed to this feed at blogtrottr.com.

If you no longer wish to receive these emails, you can unsubscribe from this feed, or manage all your subscriptions

Tuesday 29 May 2012

Secular Café: Either a Complete Idiot or a Poe

Secular Café
Serious discussion of science, skepticism, evolution, pseudoscience, and the paranormal
Either a Complete Idiot or a Poe
May 29th 2012, 21:10

Not sure which.

You are receiving this email because you subscribed to this feed at blogtrottr.com.

If you no longer wish to receive these emails, you can unsubscribe from this feed, or manage all your subscriptions

Monday 28 May 2012

Secular Café: Susan Haack: Six Signs of Scientism

Secular Café
Serious discussion of science, skepticism, evolution, pseudoscience, and the paranormal
Susan Haack: Six Signs of Scientism
May 28th 2012, 22:02

Susan Haack has also written about "the six signs of scientism":

1. The honorific use of "science" and its cognates
2. Inappropriately borrowed scientific trappings
3. Preoccupation with "the problem of demarcation"
4. The quest for "scientific method"
5. Looking to the sciences for answers to questions beyond their scope
6. Denigrating the non-scientific

Susan Haack: Six Signs of Scientism (PDF)
Susan Haack – Six Signs of Scientism – YouTube

Some of what she describes is what Richard Feynman had called Cargo Cult Science, something that has the appearance of science but not its substance. Some of it may also be called (Wikipedia)physics envy:
Quote:

In science, the term physics envy is used to criticize a tendency (perceived or real) of softer sciences and liberal arts to try to obtain mathematical expressions of their fundamental concepts, as an attempt to move them closer to harder sciences, particularly physics.
As to the "demarcation question", I prefer to avoid it. I consider pseudoscience to be failed science or greatly flawed science.

You are receiving this email because you subscribed to this feed at blogtrottr.com.

If you no longer wish to receive these emails, you can unsubscribe from this feed, or manage all your subscriptions

Secular Café: Social-network research of mythological tales

Secular Café
Serious discussion of science, skepticism, evolution, pseudoscience, and the paranormal
Social-network research of mythological tales
May 28th 2012, 18:41

[1205.4324] Universal Properties of Mythological Networks -- Pádraig Mac Carron and Ralph Kenna

There has been a lot of research into the statistical properties of biological and social networks, and many networks show interesting statistical regularities.

The authors mentioned studies of social networks like those of company directors, jazz musicians, movie actors, scientific coauthors, as well as online social networks. They also used a study of a fictional social network: Marvel superheroes. As a further check, they analyzed Victor Hugo's Les Misérables, William Shakespeare's Richard III, JRR Tolkien's Fellowship of the Ring, and JK Rowling's Harry Potter.

The mythological stories they worked on were
  • Beowulf -- a medieval English epic
  • The Iliad -- an ancient Greek epic
  • The Táin Bó Cuailnge -- a medieval Irish epic

The Iliad's characters' social network was much like real ones, while Beowulf's and the TBC's ones were much like fictional ones. However, removing the central character of Beowulf and the 6 central characters of the TBC yielded social networks much like real social networks.

The authors suggested that as evidence for partial historicity of those three epics.


However, there is a lot of comparison work that was left undone. What happens when one removes the central characters in the fictional works that they analyzed? What are the statistics of detailed biographies of well-documented people? Of detailed histories of well-documented events? What happens when one removes the central characters from those?

Like a history of the US Civil War or World War II, and biographies of Abraham Lincoln, Jefferson Davis, Franklin Delano Roosevelt, Winston Churchill, Adolf Hitler, Joseph Stalin, Hideki Tojo, etc.

Or a history of the discovery of quantum mechanics, something that took place over several years, and that had no central figure.

This work can be extended to the more reliable ancient histories, like Suetonius's The Twelve Caesars, and the later parts of Livy's History of Rome. The earlier parts of Livy's history would be an interesting comparison.


As to mythological works, one could look at some from the Middle Ages that were based on real people and events. The Song of Roland was based on the Battle of Roncesvalles in 778, and its oldest manuscript dates back to 1140 - 1170. Likewise, Theodoric the Great ruled Italy around 500 CE, and legendary mentions as Dietrich von Bern start around 800 CE.


If this method proves reliable, then it can be extended to ancient texts whose historicity is more controversial. An obvious one is the Bible.

In its early history, where does the mythology end and the reliable history begin? It's usually agreed that its history up to the conquest of Canaan is mythological, and that its history starting with the Dual Monarchy is at least somewhat reliable. In between are the likes of Kings David and Solomon.

Then, of course, there is the question of the historicity of Jesus Christ. The canonical Gospels don't give us much to work with, it must be said, but they are full of detail compared to the rest of the New Testament, many of the noncanonical Gospels, and purported outside sources like Josephus.


The main problem is that their method is rather subjective and labor-intensive, requiring carefully reading the texts. They resorted to that after discovering that automated methods were less-than-reliable. Using mentions in encyclopedia articles depended on the encyclopedia, for instance. However, natural-language processing may supply an alternative. Their method does have a plus, however. They were able to identify friendly and hostile relationships, something that they found useful.

You are receiving this email because you subscribed to this feed at blogtrottr.com.

If you no longer wish to receive these emails, you can unsubscribe from this feed, or manage all your subscriptions

Sunday 27 May 2012

Secular Café: Publishing negative results

Secular Café
Serious discussion of science, skepticism, evolution, pseudoscience, and the paranormal
Publishing negative results
May 28th 2012, 04:13

[1205.4251] Scientific Utopia: II. Restructuring incentives and practices to promote truth over publishability -- Brian A. Nosek, Jeffrey R. Spies, Matt Motyl

One of the things that the authors complained about is a bias toward publishing positive results. It does more for one's career, and many journal editors reject papers containing negative results.

(Wikipedia)Publication bias mentions the "file-drawer effect", as it is sometimes called.
file-drawer effect - The Skeptic's Dictionary - Skepdic.com
CSI | Meta-Analysis and the Filedrawer Effect - Committee for Skeptical Inquiry
File drawer effect: Science studies neglecting negative results - USA Today
Quote:

"The average frequency of positive results was significantly higher when moving from the physical, to the biological to the social sciences, and in applied versus pure disciplines, all of which confirms previous findings. Space science had not only the lowest frequency of positive results overall, it was also the only discipline to show a slight decline in positive results over the years, together with Neuroscience & Behaviour," says the study.

However, some fields of science can give some negative results a positive spin: upper limits and lower limits. For instance, Particle Data Group features numerous upper limits and lower limits. Some examples:

Electron-positron relative charge difference: < 8*10-9
Their relative charge abs-val difference: < 4*10-8
Their relative magnetic-moment abs-val difference: (-0.5 +- 2.1)*10-12
The electron's electric-dipole moment: (0.069 +- 0.074)*10-26 e*cm
Its mean life: > 4.6*1026 years (nu-e + gamma), > 6.4*1024 (disappearance and nuclear de-excitation experiments)
abs-val = absolute value

Heavy Charged Leption: mass > 100.8 GeV
4th Generation Top Quark: mass > 256 GeV
4th Generation Bottom Quark: mass > 128 to 338 GeV, depending on the decay process considered
Additional W: mass > 2 TeV (decay into electron, neutrino)
Additional Z: mass > 1.5 to 1.9 TeV (decay into 2 leptons; somewhat model-dependent)

You are receiving this email because you subscribed to this feed at blogtrottr.com.

If you no longer wish to receive these emails, you can unsubscribe from this feed, or manage all your subscriptions

Secular Café: Evidence of Dark Matter? 130-GeV gamma rays from near our galaxy's core

Secular Café
Serious discussion of science, skepticism, evolution, pseudoscience, and the paranormal
Evidence of Dark Matter? 130-GeV gamma rays from near our galaxy's core
May 27th 2012, 20:32

The Reference Frame: A confirmation of the 130 GeV dark matter-like bump - Lubos Motl
[1204.2797] A Tentative Gamma-Ray Line from Dark Matter Annihilation at the Fermi Large Area Telescope - Christoph Weniger
Quote:

The observation of a gamma-ray line in the cosmic-ray fluxes would be a smoking-gun signature for dark matter annihilation or decay in the Universe. We present an improved search for such signatures in the data of the Fermi Large Area Telescope (LAT), concentrating on energies between 20 and 300 GeV. Besides updating to 43 months of data, we use a new data-driven technique to select optimized target regions depending on the profile of the Galactic dark matter halo. In regions close to the Galactic center, we find a 4.6 sigma indication for a gamma-ray line at 130 GeV. When taking into account the look-elsewhere effect the significance of the observed excess is 3.3 sigma. If interpreted in terms of dark matter particles annihilating into a photon pair, the observations imply a dark matter mass of 129.8\pm2.4^{+7}_{-13} GeV and a partial annihilation cross-section of <\sigma v> = 1.27\pm0.32^{+0.18}_{-0.28} x 10^-27 cm^3 s^-1 when using the Einasto dark matter profile. The evidence for the signal is based on about 50 photons; it will take a few years of additional data to clarify its existence.
[1205.1045] Fermi 130 GeV gamma-ray excess and dark matter annihilation in sub-haloes and in the Galactic centre - Elmo Tempel, Andi Hektor, Martti Raidal
Quote:

We analyze publicly available Fermi-LAT high-energy gamma-ray data and confirm the existence of clear spectral feature peaked at $E_\gamma= 130$ GeV. Scanning over the Galaxy we identify several disconnected regions where the observed excess originates from. Our best optimized fit is obtained for the central region of Galaxy with a clear peak at 130 GeV with statistical significance $4.5\sigma.$ The observed excess is not correlated with Fermi bubbles. We compute the photon spectra induced by dark matter annihilations into two and four standard model particles, the latter via two light intermediate states, and fit the spectra with data. Since our fits indicate sharper and higher signal peak than in the previous works, data disfavors all but the dark matter direct two-body annihilation channels into photons. If Einasto halo profile correctly predicts the central cusp of Galaxy, dark matter annihilation cross-section to two photons is of order ten percent of the standard thermal freeze-out cross-section. If the observed gamma-ray excess comes from dark matter annihilations, we have identified the most dense dark matter sub-structures of our Galaxy. The large dark matter two-body annihilation cross-section to photons may signal a new resonance that should be searched for at the CERN LHC experiments.
Almost but not quite 5 standard deviations, but if this result holds up, it will be indirect evidence of dark matter: DM particles running into each other and making other particles as they cancel each other out.

The same effect has been observed for electrons and positrons: they go into orbit around each other, then radiate usually 2 or 3 gamma rays as they run into each other. The all-sky distribution of 511 keV electron-positron annihilation emission

You are receiving this email because you subscribed to this feed at blogtrottr.com.

If you no longer wish to receive these emails, you can unsubscribe from this feed, or manage all your subscriptions

Secular Café: 350-Year-Old Newton's Puzzle Solved By 16-Year-Old

Secular Café
Serious discussion of science, skepticism, evolution, pseudoscience, and the paranormal
350-Year-Old Newton's Puzzle Solved By 16-Year-Old
May 27th 2012, 15:35

http://www.news.com.au/technology/ge...#ixzz1w3LI5N1w

Brilliant....

Quote:

A GERMAN 16-year-old has become the first person to solve a mathematical problem posed by Sir Isaac Newton more than 300 years ago.

Shouryya Ray worked out how to calculate exactly the path of a projectile under gravity and subject to air resistance, The (London) Sunday Times reported.

The Indian-born teen said he solved the problem that had stumped mathematicians for centuries while working on a school project.

Mr Ray won a research award for his efforts and has been labeled a genius by the German media, but he put it down to "curiosity and schoolboy naivety".

"When it was explained to us that the problems had no solutions, I thought to myself, 'well, there's no harm in trying,'" he said.

Mr Ray's family moved to Germany when he was 12 after his engineer father got a job at a technical college. He said his father instilled in him a "hunger for mathematics" and taught him calculus at the age of six.

Mr Ray's father, Subhashis, said his son's mathematical prowess quickly outstripped his own considerable knowledge.

"He never discussed his project with me before it was finished and the mathematics he used are far beyond my reach," he said.

Despite not speaking a word of German when he arrived, Mr Ray will this week sit Germany's high school leaving exams, two years ahead of his peers.

Newton posed the problem, relating to the movement of projectiles through the air, in the 17th century. Mathematicians had only been able to offer partial solutions until now.

If that wasn't enough of an achievement, Mr Ray has also solved a second problem, dealing with the collision of a body with a wall, that was posed in the 19th century.

Both problems Mr Ray resolved are from the field of dynamics and his solutions are expected to contribute to greater precision in areas such as ballistics.

You are receiving this email because you subscribed to this feed at blogtrottr.com.

If you no longer wish to receive these emails, you can unsubscribe from this feed, or manage all your subscriptions

Secular Café: People-powered Olympic shopping mall: A sign of utter tech illiteracy

Secular Café
Serious discussion of science, skepticism, evolution, pseudoscience, and the paranormal
People-powered Olympic shopping mall: A sign of utter tech illiteracy
May 27th 2012, 14:06

http://www.theregister.co.uk/2012/05..._make_it_stop/

A pet peeve of mine.....people using terms like "energy" without knowing what they mean....

Quote:

Comment It's just about certain, now: Almost everybody in the world has no idea of the most basic facts regarding energy use. Most people don't even know that the words "energy" and "power" have different meanings1, and just about everyone is so massively ignorant on the subject that they actually consider that the use of special floor tiles to generate electricity from human footfalls is worth doing.

Don't believe it? Check this out, from that bastion of proper science National Geographic:

Twenty bright green rubber tiles will adorn one of the outdoor walkways at the Westfield Stratford City Mall, which abuts the new Olympic stadium in east London.

The squares aren't just ornamental. They are designed to collect the kinetic energy created by the estimated 40 million pedestrians who will use that walkway in a year, generating several hundred kilowatt-hours of electricity from their footsteps. That's enough to power half the mall's outdoor lighting.

It isn't just the French and the Guardian any more. It's us Brits, and supposedly sciencey publications like Nat Geo.

Just for reference, then: even if the vast Stratford City mall uses super-economical LED exterior lighting, just a single light can be expected to require energy supplies of more than 900 kilowatt-hours in a year (Google Doc here). There's no prospect whatsoever that "several hundred kilowatt-hours" could provide half the massive facility's outdoor lighting - this much is obvious straight off the bat.

But it gets worse:

On average, one footstep generates 7 watts of electricity, though the amount varies depending on a person's weight.

Seven watts for how long? This is meaningless twaddle.

And even worse, the headline says:

Tiles May Help Shrink Carbon Footprint by Harnessing Pedestrian Power

Nonsense. The Stratford City mall, we learn from an informative article in the CIBSE journal (pdf), will be supplied by a combination heat/electricity/cooling plant which will be capable of 46.2 Megawatts of heating, 39 Megawatts of cooling and up to 3.34 Megawatts of electrical power. It will not be running at maximum in all three categories at once, but even so we can see that the Stratford City mall's power consumption over time will run in the several tens of megawatts - for annual energy consumption of a few hundred thousand megawatt-hours.

Contrast this with "a few hundred kilowatt-hours" and we can see that the footfall generators will provide roughly one millionth of the energy the mall requires. They will not "reduce its carbon footprint" at all. Even if the whole place was tiled with footfall generators and every person on them generated 7 Watts constantly ... you would have to pack more than half the population of London in there, five million people all walking around without pause, just to keep it powered up. On a really cold or hot day you might need millions more.

It's a big mall, but it's not that big.

This is the same "Crowd Farm" idiocy that came out of the architecture faculty at MIT a few years ago. By this stage, of course, regular Reg readers would expect this sort of technological illiteracy from architects.

However we learn that in fact Laurence Kemball-Cook - the "fresh-faced 26-year-old Londoner" who helms Pavegen, the firm behind the Stratford treadmill generators - is not an architecture graduate. No, he has a degree in industrial design and technology (a course which has no requirement for any proficiency in maths or physics).

<SNIP> more at the link.....

Bootnote

1Just in case you've wandered in from somewhere else: Power is the rate at which energy is being transferred or converted. A Watt of power means that one Joule of energy is being transferred or converted per second. As Joules are very small people often use watt-hours (one watt for one hour, ie 3600 Joules) to measure energy, typically in the kilo-, mega- or giga- ranges. A kilowatt-hour (3.6 megajoules) is one "unit" of domestic energy as seen on a British utility bill.

You are receiving this email because you subscribed to this feed at blogtrottr.com.

If you no longer wish to receive these emails, you can unsubscribe from this feed, or manage all your subscriptions

Saturday 26 May 2012

Secular Café: Cool: 40,000 year old bone flute

Secular Café
Serious discussion of science, skepticism, evolution, pseudoscience, and the paranormal
Cool: 40,000 year old bone flute
May 27th 2012, 01:50

Quote:

Bone Flute Means Musical Instruments Date Back 40,000 Years, Scientists Say

By: Jennifer Welsh, LiveScience Staff Writer
Published: 05/24/2012 01:46 PM EDT on LiveScience

Early modern humans could have spent their evenings sitting around the fire, playing bone flutes and singing songs 40,000 years ago, newly discovered ancient musical instruments indicate. The bone flutes push back the date researchers think human creativity evolved.

Researchers were studying a modern human settlement called Geißenklösterle, a part of the Swabian caves system in southern Germany, when they came across the bone flutes. One is made of mammoth ivory, while the other seems to be made of bones from a bird. They also found a collection of perforated teeth, ornaments and stone tools at the site.

"These results are consistent with a hypothesis we made several years ago that the Danube River was a key corridor for the movement of humans and technological innovations into central Europe between 40,000 and 45,000 years ago," study researcher Nick Conard, of Tübingen University, said in a statement.
...
http://www.huffingtonpost.com/2012/0...n_1544417.html

You are receiving this email because you subscribed to this feed at blogtrottr.com.

If you no longer wish to receive these emails, you can unsubscribe from this feed, or manage all your subscriptions

Secular Café: Study on "gay cure" was "fatally flawed"

Secular Café
Serious discussion of science, skepticism, evolution, pseudoscience, and the paranormal
Study on "gay cure" was "fatally flawed"
May 26th 2012, 06:52

See this

http://www.guardian.co.uk/world/2012...e-study-flawed

Quote:

One of the most influential figures in modern psychiatry has apologised to America's gays for a scientific study which supported attempts to "cure" people of their homosexuality.

The survey, published in 2001, looked at "reparative therapy" and was hailed by religious and social conservatives in America as proof that gay people could successfully become straight if they were motivated to do so.

But Dr Robert Spitzer has now apologised in the same academic journal that published his original study, calling it "fatally flawed". "I believe I owe the gay community an apology," his letter said. "I also apologise to any gay person who wasted time and energy undergoing some form of reparative therapy because they believed that I had proven that reparative therapy works."

Spitzer's letter, which was leaked online before its publication in the Archives of Sexual Behaviour, is sure to cause delight among gay civil rights groups and stir up anger among social conservatives, who have used the study to combat the acceptance of homosexuality as a normal part of human society.

You are receiving this email because you subscribed to this feed at blogtrottr.com.

If you no longer wish to receive these emails, you can unsubscribe from this feed, or manage all your subscriptions

Friday 25 May 2012

Secular Café: The Droste Effect

Secular Café
Serious discussion of science, skepticism, evolution, pseudoscience, and the paranormal
The Droste Effect
May 26th 2012, 01:04

.. nervously I venture into these sacrosanct posts.. but since I'm here I would like to know if this effect, named after the the illustration on the Droste cocoa Box can go to infinity??

You are receiving this email because you subscribed to this feed at blogtrottr.com.

If you no longer wish to receive these emails, you can unsubscribe from this feed, or manage all your subscriptions

Secular Café: "tractor beam" concept theoretically demonstrated

Secular Café
Serious discussion of science, skepticism, evolution, pseudoscience, and the paranormal
"tractor beam" concept theoretically demonstrated
May 25th 2012, 20:52

http://www.gizmag.com/bessel-beam-tractor-beam/22678/

Cool....

Quote:

Last year, we looked at three potential "tractor beam" technologies being evaluated by NASA to deliver planetary or atmospheric particles to a robotic rover or orbiting spacecraft. At the time, the third of these, which involved the use of a Bessel beam, only existed on paper. Researchers at Singapore's Agency for Science, Technology and Research (A*STAR) have now proven the theory behind the concept, demonstrating how a tractor beam can be realized in the real world – albeit on a very small scale.

Haifeng Wang at the A*STAR Data Storage Institute and colleagues studied the properties of Bessel beams, which, unlike normal laser beams, don't diffract or spread out as they propagate. While light will usually be scattered backwards when a laser beam hits a small particle in its path, pushing the particle forward, the A*STAR team showed theoretically that light from a Bessel beam scatters off particles that are sufficiently small in a forward direction. This means that the particle is pulled back towards the observer.

The team says the amount of tractor beam force depends on various factors, including the electrical and magnetic properties of the particles. While, like a different tractor beam technology developed by researchers at the Australian National University (ANU), the forces exerted on the particles are very small, Wang says his team's tractor beams do have real world applications.

While true Bessel beams are impossible to create, as they would require an infinite amount of energy, reasonably good approximations can be made and are used in many optical applications.

"These beams are not very likely to pull a human or a car, as this would require a huge laser intensity that may damage the object," says Wang. "However, they could manipulate biological cells because the force needed for these doesn't have to be large."

He adds that the technology could also be used to gauge the tensile strength of cells, which can reveal whether a cell has been infected. "For instance, the malaria-infected blood cell is more rigid, and this technology would be an easy-to-use tool to measure this," says Wang.

The team's research appears in the journal Physical Review Letters.

You are receiving this email because you subscribed to this feed at blogtrottr.com.

If you no longer wish to receive these emails, you can unsubscribe from this feed, or manage all your subscriptions

Secular Café: Male contraceptive pill a step closer

Secular Café
Serious discussion of science, skepticism, evolution, pseudoscience, and the paranormal
Male contraceptive pill a step closer
May 25th 2012, 17:15

http://uk.lifestyle.yahoo.com/male-c...-pill-men.html

I wonder how many rethuglicans will approve of this......

Quote:

Scientists are hopeful that a male contraceptive pill could soon be on its way, after trials in mice identified a gene essential to sperm production.

The gene, called Katnal1, is important at the end of the sperm-creating process and scientists believe blocking it could induce temporary infertility. The breakthrough came when a team of researchers at the Centre for Reproductive Health at the University of Edinburgh were conducting investigations into male infertility.

Crucially, blocking the gene would be a temporary measure and, as the pill would potentially be non-hormonal, there should be few side effects.

It's not the first attempt made at a male contraceptive pill but options for men currently remain limited to condoms or a vasectomy. Experts have called a non-hormonal contraceptive pill for men the 'Holy Grail'.

"The key in developing a non-hormonal contraceptive for men is that the molecular target needs to be very specific for either sperm or other cells in the testicle which are involved in sperm production," said Dr Allan Pacey, senior lecturer in andrology at the University of Sheffield.

"If they are not, then such a contraceptive could have unwanted side effects on other cells and tissues in the body and may even be dangerous.

"The gene described by the research group in Edinburgh sounds like an exciting new possible target for a new male contraceptive, but it may also shed light on why some men are sub-fertile and why their sperm does not work properly."

You are receiving this email because you subscribed to this feed at blogtrottr.com.

If you no longer wish to receive these emails, you can unsubscribe from this feed, or manage all your subscriptions

Thursday 24 May 2012

Secular Café: Finding the Tree of Life -- how all the Earth's biota is related

Secular Café
Serious discussion of science, skepticism, evolution, pseudoscience, and the paranormal
Finding the Tree of Life -- how all the Earth's biota is related
May 24th 2012, 21:25

Researchers aim to assemble the tree of life for all 2 million named species
Quote:

A new initiative aims to build a grand tree of life that brings together everything scientists know about how all living things are related, from the tiniest bacteria to the tallest tree.
There are bits and pieces of it all over the scientific literature, including a lot of work on the more familiar species and higher-level relationships, but a lot of it is not very database-friendly.
Quote:

But now, thanks to a three-year, $5.76 million grant from the U.S. National Science Foundation, a team of scientists and developers from ten universities aims to make that a reality.
It will be the ultimate supertree, a tree constructed from several sources of data.

The project's home page: OPEN TREE OF LIFE

Not very much there now, it must be said.

But if you are impatient, you can go to
Tree of Life Web Project - rather technical
History of life through time

You are receiving this email because you subscribed to this feed at blogtrottr.com.

If you no longer wish to receive these emails, you can unsubscribe from this feed, or manage all your subscriptions

Secular Café: Business turns the dead into diamonds

Secular Café
Serious discussion of science, skepticism, evolution, pseudoscience, and the paranormal
Business turns the dead into diamonds
May 24th 2012, 10:02

A new option for the dead:

Quote:

Business turns the dead into diamonds
By Ramy Inocencio, CNN
May 24, 2012 -- Updated 0746 GMT (1546 HKT)

Hong Kong (CNN) -- Eva Wu has kept her son's room unchanged ever since he died in January of 2011. Cornald passed away from a rare form of cancer, known as PEComa, at age 17. Divorced and single, Wu recalled his optimism even in his final days.

"He always comforted me. He said 'Mummy, I know what's going on. I'm not afraid of dying. I know where I'm going to. I have Jesus in my heart so don't worry about me'."

To keep him close in death as he was in life, Wu had his ashes made into a diamond. "I feel peace. I feel he's near me. And it's 100% him. Nothing else but him," said Wu, who keeps the diamond on a cross necklace. "And I can recall his smiling face, and I can recall his gentle character."

That peace is thanks to the Hong Kong company Algordanza, which has been making "remembrance diamonds" since 2008, said Scott Fong, local director of Algordanza.

Headquartered in Switzerland, Algordanza's name comes from the local Romansch language meaning "remembrance." An engineer by education, Fong thought there could be a demand for the service after his mother's aunt passed away in 2007, and he found end-of-life services in Hong Kong to be "crude" and options for burial few.

The ashes-to-diamond process is fairly straightforward, Fong said. Algordanza sends 200 grams of cremated remains to its laboratory in Switzerland. The carbon from those ashes is then filtered out to more than 99% purity and refined into silky, black graphite. A machine then applies volcano-like pressure and temperature: Nine hours later, a synthetic diamond -- which has a bluish rather than clear tint, owing to boron found naturally in the body -- is born.

A quarter-carat diamond retails for about $3000, Fong said. A two-carat diamond, the biggest that Algordanza makes, costs about $37,000.

...
http://edition.cnn.com/2012/05/24/bu...html?hpt=hp_c1

You are receiving this email because you subscribed to this feed at blogtrottr.com.

If you no longer wish to receive these emails, you can unsubscribe from this feed, or manage all your subscriptions

Secular Café: Turtles are a kind of bird with the governor turned low

Secular Café
Serious discussion of science, skepticism, evolution, pseudoscience, and the paranormal
Turtles are a kind of bird with the governor turned low
May 24th 2012, 10:28

Turtles are a kind of bird with the governor turned low. - Edward Hoagland from "The Courage of Turtles"

Quote:

Turtles More Closely Related to Birds Than Lizards and Snakes, Genetic Evidence Shows

ScienceDaily (May 23, 2012) — The evolutionary origin of turtles is one of the last unanswered questions in vertebrate evolution. Paleontological and morphological studies place turtles as either evolving from the ancestor of all reptiles or as evolving from the ancestor of snakes, lizards, and tuataras. Conflictingly, genetic studies place turtles as evolving from the ancestor of crocodilians and birds.

Having recently looked at more than a thousand of the least-changed regions in the genomes of turtles and their closest relatives, a team of Boston University researchers has confirmed that turtles are most closely related to crocodilians and birds rather than to lizards, snakes, and tuataras.

The researchers published their findings in the Royal Society journal Biology Letters. By showing that turtles are closer relatives to crocodiles and birds (archosaurs) than lizards, snakes and tuatara (lepidosaurs), the study challenges previous anatomical and paleontological assessments. Nick Crawford, a post-graduate researcher in biology in BU's Graduate School of Arts & Sciences and lead author of the study, achieved these findings by using computational analysis to examine regions of the different animals' genomes.

"Turtles have been an enigmatic vertebrate group for a long time and morphological studies placed them as either most closely related to the ancestral reptiles, that diverged early in the reptile evolutionary tree, or as closer to lizards, snakes, and tuataras," says Crawford.

The study is the first genomic-scale analysis addressing the phylogenetic position of turtles, using over 1000 loci from representatives of all major reptile lineages including tuatara (lizard-like reptiles found only in New Zealand). Earlier studies of morphological traits positioned turtles at the base of the reptile tree with lizards, snakes and tuatara (lepidosaurs), whereas molecular analyses typically allied turtles with crocodiles and birds (archosaurs).

....

http://www.sciencedaily.com/releases...0523200301.htm

and the Edward Hoagland essay if anyone is interested:
"The Courage of Turtles" - http://www.cwu.edu/~garrisop/makeup_quiz_essays.pdf

You are receiving this email because you subscribed to this feed at blogtrottr.com.

If you no longer wish to receive these emails, you can unsubscribe from this feed, or manage all your subscriptions

Wednesday 23 May 2012

Secular Café: Does Extending Life go Against Evolution

Secular Café
Serious discussion of science, skepticism, evolution, pseudoscience, and the paranormal
Does Extending Life go Against Evolution
May 23rd 2012, 11:32

Quote:

Radical Life Extension Is Already Here, But We're Doing it Wrong
By Ross Andersen

May 21 2012, 1:27 PM ET 109

We've already tacked three decades onto the average lifespan of an American, so what's wrong with adding another few decades?

So far as we know, the last hundred years have been the most radical period of life extension in all of human history. At the turn of the twentieth century, life expectancy for Americans was just over 49 years; by 2010, that number had risen to 78.5 years, mostly on account of improved sanitation and basic medicine. But life extension doesn't always increase our well-being, especially when all that's being extended is decrepitude. There's a reason that Ponce de Leon went searching for the fountain of youth---if it were the fountain of prolonged dementia and arthritis he may not have bothered.

Over the past twenty years, biologists have begun to set their sights on the aging process itself, in part by paying close attention to species like the American Lobster, which, despite living as long as fifty years, doesn't seem to age much at all. Though some of this research has shown promise, it's not as though we're on the brink of developing a magical youth potion. Because aging is so biologically complex, encompassing hundreds of different processes, it's unlikely that any one technique will add decades of youth to our lives. Rather, the best we can hope for is a slow, incremental lengthening of our "youth-span," the alert and active period of our lives.

Not everyone is thrilled by the prospect of radical life extension. As funding for anti-aging research has exploded, bioethicists have expressed alarm, reasoning that extreme longevity could have disastrous social effects. Some argue that longer life spans will mean stiffer competition for resources, or a wider gap between rich and poor. Others insist that the aging process is important because it gives death a kind of time release effect, which eases us into accepting it. These concerns are well founded. Life spans of several hundred years are bound to be socially disruptive in one way or another; if we're headed in that direction, it's best to start teasing out the difficulties now.

But there is another, deeper argument against life extension---the argument from evolution. Its proponents suggest that we ought to avoid tinkering with any human trait borne of natural selection. Doing so, they argue, could have unforeseen consequences, especially given that natural selection has such a sterling engineering track record. If our bodies grow old and die, the thinking goes, then there must be a good reason, even if we don't understand it yet. Nonsense, says Bennett Foddy, a philosopher (and flash game developer!) from Oxford, who has written extensively about the ethics of life extension. "We think about aging as being a natural human trait, and it is natural, but it's not something that was selected for because it was beneficial to us." Foddy told me. "There is this misconception that everything evolution provides is beneficial to individuals and that's not correct."
....
http://www.theatlantic.com/health/ar...-wrong/257383/

You are receiving this email because you subscribed to this feed at blogtrottr.com.

If you no longer wish to receive these emails, you can unsubscribe from this feed, or manage all your subscriptions