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2008-09-18

FerroFluids: Physics is Beautiful

"Ferrofluids are one of my favorite examples of beauty and aesthetics occurring spontaneously as a simple reaction between elements and forces of nature. A fluid, formless and simple, turns instantly into a sculpture, structural and complex with little more than the application of a magnetic field. The phenomena is used in many industrial applications including the seal on the hard drive spinning in your computer and has recently been used to create abstract art."

 http://greenlineblog.com/ferrofluids-physics-is-beautiful/

Do nuclear decay rates depend on our distance from the sun?

"Here’s an interesting conundrum involving nuclear decay rates.

We think that the decay rates of elements are constant regardless of the ambient conditions (except in a few special cases where beta decay can be influenced by powerful electric fields).

So that makes it hard to explain the curious periodic variations in the decay rates of silicon-32 and radium-226 observed by groups at the Brookhaven National Labs in the US and at the Physikalisch-Technische Bundesandstalt in Germany in the 1980s.

Today, the story gets even more puzzling. Jere Jenkins and pals at Purdue University in Indiana have re-analysed the raw data from these experiments and say that the modulations are synchronised with each other and with Earth’s distance from the sun. (Both groups, in acts of selfless dedication, measured the decay rates of silicon-32 and radium-226 over a period of many years.)

In other words, there appears to be an annual variation in the decay rates of these elements."


http://arxivblog.com/?p=596

Scientists Discover Cows Point North

"Dr Sabine Begall and colleagues from the University of Duisburg-Essen have discovered that cows tend to point north. The researchers studied deer in the Czech Republic and looked at thousands of images of cattle on Google Earth. The animals tended to face north when eating or resting. "We conclude that the magnetic field is the only common and most likely factor responsible for the observed alignment," the scientists wrote in an article. I guess cows will become the must-have item for long-distance hikers now. Having an edible compass would come in handy if you get lost."

http://science.slashdot.org/article.pl?sid=08/08/26/1514226

Mathway: Step-by-Step Math Problem Solver

http://www.mathway.com/

Invisibility Cloak Technology maybe closer than you think



"Scientists maybe a step closer to creating materials that will allow people and other objects to go invisible by redirecting light around 3D objects using metamaterials. Which are artificially engineered structures created at a nano scale that contain optical properties not found in nature."

http://www.gadgettastic.com/2008/08/17/invisibility-cloak-technology-maybe-closer-than-you-think/

Britain from Above

"Here's how the air, ground, data, landline, cellphone, and sea ship traffic looks from space in Great Britain, one of the busiest countries on Earth. The BBC's Britain from Above documentary took satellite and air images and mixed it with 3D GPS data to create these breathtaking high resolution pictures and videos"

http://gizmodo.com/5036052/traffic-from-space-videos-blow-our-minds-pants-and-socks

Quantum communication: when 0 + 0 is not equal to 0

"Graeme Smith at the IBM Watson Research Center in Yorktown Heights NY (a lab that has carried the torch for this problem) and Jon Yard from Los Alamos National Labs have made what looks to be an important breakthrough by calculating that two zero-capacity quantum channels can have a nonzero capacity when used together.

That’s interesting because it indicates that physicists may have been barking up the wrong tree with this problem: perhaps the quantum capacity of a channel does not uniquely specify its ability for transmitting quantum information. And if not, what else is relevant?"

http://arxivblog.com/?p=554

Dolphins Name Themselves

"A high-pitched "wee-o-wee-o-wee-o-wee" whistle might not sound like much to you, but it's exactly how a dolphin might introduce itself.

Because sight is limited in the ocean, dolphins create individual "name" calls to communicate their whereabouts to friends and families.

But it's not as simple as just recognizing a voice, as with most animals. A new study reveals that the calls contain frequency changes that dolphins recognize."

http://www.livescience.com/animals/060508_dolphin_names.html

The Last Theorem by Arthur C Clarke and Frederik Pohl

"Arthur C Clarke's final book of science fiction, written with Frederik Pohl, transports the reader to the first Lunar Olympics. This is an exclusive extract"

http://www.telegraph.co.uk/arts/main.jhtml?xml=/arts/2008/07/26/nosplit/boextract126.xml

Seeing ourselves

"Researchers have determined that mirrors can subtly affect human behavior, often in surprisingly positive ways. Subjects tested in a room with a mirror have been found to work harder, to be more helpful and to be less inclined to cheat, compared with control groups performing the same exercises in nonmirrored settings. Reporting in the Journal of Personality and Social Psychology, C. Neil Macrae, Galen V. Bodenhausen and Alan B. Milne found that people in a room with a mirror were comparatively less likely to judge others based on social stereotypes about, for example, sex, race or religion.

" 'When people are made to be self-aware, they are likelier to stop and think about what they are doing,' Dr. Bodenhausen said. 'A byproduct of that awareness may be a shift away from acting on autopilot toward more desirable ways of behaving.' Physical self-reflection, in other words, encourages philosophical self-reflection, a crash course in the Socratic notion that you cannot know or appreciate others until you know yourself. ...

"In a report titled 'Mirror, Mirror on the Wall: Enhancement in Self-Recognition,' which appears online in The Personality and Social Psychology Bulletin, Nicholas Epley and Erin Whitchurch described experiments in which people were asked to identify pictures of themselves amid a lineup of distracter faces. Participants identified their personal portraits significantly quicker when their faces were computer enhanced to be 20 percent more attractive. They were also likelier, when presented with images of themselves made prettier, homelier or left untouched, to call the enhanced image their genuine, unairbrushed face. Such internalized photoshoppery is not simply the result of an all-purpose preference for prettiness: when asked to identify images of strangers in subsequent rounds of testing, participants were best at spotting the unenhanced faces.

"How can we be so self-delusional when the truth stares back at us? 'Although we do indeed see ourselves in the mirror every day, we don't look exactly the same every time,' explained Dr. Epley, a professor of behavioral science at the University of Chicago Graduate School of Business. There is the scruffy-morning you, the assembled-for-work you, the dressed-for-an-elegant-dinner you. 'Which image is you?' he said. 'Our research shows that people, on average, resolve that ambiguity in their favor, forming a representation of their image that is more attractive than they actually are.' "

Natalie Angier, "Mirrors Don't Lie. Mislead? Oh, Yes." The New York Times, Science Times, July 22, 2008, F1.


http://www.delanceyplace.com/