Scientists Discover Material Harder Than Diamond

Photo: A diamond ring. Scientists have calculated that wurtzite boron nitride and lonsdaleite (hexagonal diamond) both have greater indentation strengths than diamond. Source: English Wikipedia.

(PhysOrg.com) -- Currently, diamond is regarded to be the hardest known material in the world. But by considering large compressive pressures under indenters, scientists have calculated that a material called wurtzite boron nitride (w-BN) has a greater indentation strength than diamond. The scientists also calculated that another material, lonsdaleite (also called hexagonal diamond, since it’s made of carbon and is similar to diamond), is even stronger than w-BN and 58 percent stronger than diamond, setting a new record.

This analysis marks the first case where a material exceeds diamond in strength under the same loading conditions, explain the study’s authors, who are from Shanghai Jiao Tong University and the University of Nevada, Las Vegas. The study is published in a recent issue of Physical Review Letters.

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Astronomers Unveiling Life's Cosmic Origins

The Cosmic Chemistry Cycle. (Credit: Bill Saxton, NRAO/AUI/NSF)

From Science Daily:

ScienceDaily (Feb. 13, 2009) — Processes that laid the foundation for life on Earth -- star and planet formation and the production of complex organic molecules in interstellar space -- are yielding their secrets to astronomers armed with powerful new research tools, and even better tools soon will be available.

Astronomers described three important developments at a symposium on the "Cosmic Cradle of Life" at the annual meeting of the American Association for the Advancement of Science in Chicago, IL.

In one development, a team of astrochemists released a major new resource for seeking complex interstellar molecules that are the precursors to life. The chemical data released by Anthony Remijan of the National Radio Astronomy Observatory (NRAO) and his university colleagues is part of the Prebiotic Interstellar Molecule Survey, or PRIMOS, a project studying a star-forming region near the center of our Milky Way Galaxy.

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The Romantic Evolution of True Love

From Live Science:

True love is all about finding that one certain someone, and anthropologists have led us to believe that the quest for the perfect mate is evolutionarily based. Humans are, the researchers contend, a naturally pair-boded species.

The standard scenario goes like this: Human babies are born about three months too soon because upright walking changed the female pelvis and babies have to get out before their heads grow too big. As a result, human babies are born neurologically unfinished; they can’t sit up or grasp or do much of anything. By necessity, adult humans are designed to respond to the cries and babbles of infants; we rush to feed them and pick them up. The burden of this kind of child care is so intense, they say, that it takes two parents to bring up even one baby.

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Valentine’s Gifts For Your Science Geek

From Smithsonian Magazine:

Valentine’s Day quickly approaches, and you may be wondering what to buy for your own geeky Valentine (or what to request for yourself). You can start off by sending a Scientist Valentine. Darwin might be the best choice, since his 200th birthday is only two days before V-Day.

Let’s move on to the classic gifts of chocolate and candy. There’s a chocolate-colored tee with the molecule theobromine, the chemical that makes chocolate so fun. The molecule can also be found in the form of earrings or a necklace.

You can show your love with a gummy heart, an anatomical one, that is. But consider carefully—the cannibalism aspect might scare someone off.

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Goodbye Mr Nice Guy

From Scienceagogo:

Just in time for Valentine's Day, researchers have turned up some new answers to the age-old question of what we want in our partners. It turns out that "chastity" is unimportant and men are more interested in an educated woman who is a good financial prospect; and women are more interested in a man who wants a family and less picky about whether he's a "nice guy."

Sociologists Christine Whelan and Christie Boxer, from the University of Iowa (UI), arrived at their findings by analyzing a 2008 survey of more than 1,100 undergraduates from four different universities and comparing the results to past mate-preference research.

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The Most Tragic Love Stories in History

A painting of Antony and Cleopatra by Lawrence Alma-Tadema in 1885

From Live Science:

Nothing celebrates Valentine's Day quite like a good love story. And by good, we mean tragic, of course.

Though Shakespeare's plays are littered with doomed lovers — unrequited passion and death makes for good reading, apparently — couples equally as star-crossed can be found in the world's history books.

These five tragic historical tales from the ancient to more recent past are as sad as anything that has ever been conjured up in fiction:

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Cooking Helped Humans Evolve ... With Side Effects

From Wired Science:

CHICAGO — Raw-food devotees take note: Your diet is not in any way natural. Humans are as adapted to cooking our food as cows are to eating grass, or ticks are to sucking blood.

"Cooking is a human universal," said Harvard primatologist Richard Wrangham at the American Association for the Advancement of Science meeting here Friday. While cooking kills parasites and other pathogens, Wrangham believes this health benefit is not its primary contribution.

"The fundamental importance of cooking is that it provides increased sources of energy," he said.

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New Refrigeration System Based On Magnetics More Economical And Quieter Than Current Technology

A magnetocaloric material heats up when magnetized (b); if cooled and then demagnetized (c), its temperature drops dramatically (d). NIST scientists may have found a way to use magnetocalorics in your fridge. (Credit: Talbott, NIST)

From Science Daily:

ScienceDaily (Feb. 12, 2009) — Your refrigerator’s humming, electricity-guzzling cooling system could soon be a lot smaller, quieter and more economical thanks to an exotic metal alloy discovered by an international collaboration working at the National Institute of Standards and Technology (NIST)’s Center for Neutron Research (NCNR).

The alloy may prove to be a long-sought material that will permit magnetic cooling instead of the gas-compression systems used for home refrigeration and air conditioning. The magnetic cooling technique, though used for decades in science and industry, has yet to find application in the home because of technical and environmental hurdles—but the NIST collaboration may have overcome them.

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Saliva: Secret Ingredient In The Best Kisses

From Live Science:

CHICAGO — Go ahead. Kiss the girl. And you might make it a wet one, because scientists who are starting to understand the biochemistry of kisses say that saliva increases sex drive.

Those in the kissing-science field of philematology are finding links between kissing and the hormones that affect coupling, researchers said here today at the annual meeting of the American Association for the Advancement of Science (AAAS). And these hormones are one of the keys to our reproductive success, so there's a link to evolution and passing on our genes to the next generation.

"There is evidence that saliva has testosterone in it," said Rutgers University anthropologist Helen Fisher, and testosterone increases sex drive. "And there is evidence that men like sloppier kisses with more open mouth. That suggests they are unconsciously trying to transfer testosterone to stimulate sex drive in women."

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Scanner Reveals Details Of Egyptian Mummy Inside Casket

Scan shows coffin and details of Meresamun's skeleton,
including her eye sockets, jaw and shoulders

From The Independent:

Stunning images from within the unopened casket of a 3,000-year-old Egyptian mummy have been revealed using a hi-tech hospital scanner.

The elaborately decorated coffin contains the wrapped remains of Meresamun, a woman believed to have been a singer-priestess at a temple in Thebes in 800 BC.

Experts do not want to disturb the casket, which has remained sealed since Meresamun was laid to rest almost 1,000 years before the birth of Christ.

But now cutting edge X-ray technology has allowed scientists to peer through the coffin and obtain astonishing 3D images of the mummy, still wrapped in her linen bandages.

A state-of-the-art computed tomography CT scanner was used to peel away the layers and reveal Meresamun's skeleton.

The mummy's remaining internal organs can be seen, as well as what appear to be stones placed in her eye sockets.

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How Broken Arm Led Scientists To Genome Of Neanderthals

From McClatchy Newspapers:

WASHINGTON — It was an unfortunate accident, but a lucky break for modern science.

About 38,000 years ago, a Neanderthal man living in what's now Croatia broke his left arm, forcing him to use his other arm for most tasks. That increased the mass and density of the bone in the upper right arm, and preserved his DNA for researchers — using a dentist's drill — to recover many millennia later.

With that bit of material, along with scraps of DNA collected from half a dozen other Neanderthal fossils, scientists have now completed a rough partial draft of the genome of humans' prehistoric cousins.

The Neanderthals lived for hundreds of thousands of years in Europe and western Asia, but went extinct about 30,000 years ago. They were replaced by Cro-Magnons, the ancestors of modern humans.

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Lifeline for Renewable Power

Photo: Green lines: Tapping energy from remote wind and solar farms will require more high-voltage transmission lines like these, near Yermo, CA, which link southern Nevada with Los Angeles. Credit: Ewan Burns

Technology Review:

Without a radically expanded and smarter electrical grid, wind and solar will remain niche power sources.

Push through a bulletproof revolving door in a nondescript building in a dreary patch of the former East Berlin and you enter the control center for Vattenfall Europe Transmission, the company that controls northeastern Germany's electrical grid. A monitor displaying a diagram of that grid takes up most of one wall. A series of smaller screens show the real-time output of regional wind turbines and the output that had been predicted the previous day. Germany is the world's largest user of wind energy, with enough turbines to produce 22,250 megawatts of electricity. That's roughly the equivalent of the output from 22 coal plants--enough to meet about 6 percent of Germany's needs. And because Vattenfall's service area produces 41 percent of German wind energy, the control room is a critical proving ground for the grid's ability to handle renewable power.

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13 Facts About Friday The 13th

From Live Science:

If you fear Friday the 13th, then batten down the hatches. This week's unlucky day is the first of three this year.

The next Friday the 13th comes in March, followed by Nov. 13. Such a triple whammy comes around only every 11 years, said Thomas Fernsler, a math specialist at the University of Delaware who has studied the number 13 for more than 20 years.

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Wireless Electricity Is Here (Seriously)

Ryan Tseng holds his wirelessly lit lightbulb 3 inches above its power source.
Photograph by Phillip Toledano

From Fast Company:

I'm standing next to a Croatian-born American genius in a half-empty office in Watertown, Massachusetts, and I'm about to be fried to a crisp. Or I'm about to witness the greatest advance in electrical science in a hundred years. Maybe both.

Either way, all I can think of is my electrician, Billy Sullivan. Sullivan has 11 tattoos and a voice marinated in Jack Daniels. During my recent home renovation, he roared at me when I got too close to his open electrical panel: "I'm the Juice Man!" he shouted. "Stay the hell away from my juice!"

He was right. Only gods mess with electrons. Only a fool would shoot them into the air. And yet, I'm in a conference room with a scientist who is going to let 120 volts fly out of the wall, on purpose.

"Don't worry," says the MIT assistant professor and a 2008 MacArthur genius-grant winner, Marin Soljacic (pronounced SOLE-ya-cheech), who designed the box he's about to turn on. "You will be okay."

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Crash Of US, Russian Satellites A Threat In Space

NASA’s Orbital Debris Program Office has counted about 17,000 objects larger than 10 centimeters, and it estimates that there are more than 200,000 particles between one and 10 centimeters. The debris objects shown here are an artist's impression based on actual density data. The objects are shown at an exaggerated size to make them visible at the scale shown. (European Space Agency)

From Yahoo News/AP:

MOSCOW – U.S. and Russian officials traded shots Thursday over who was to blame for a huge satellite collision this week that spewed speeding clouds of debris into space, threatening other unmanned spacecraft in nearby orbits.

The smashup 500 miles (800 kilometers) over Siberia on Tuesday involved a derelict Russian spacecraft designed for military communications and a working satellite owned by U.S.-based Iridium, which served commercial customers as well as the U.S. Department of Defense.

A prominent Russian space expert suggested NASA fell down on the job by not warning of the collision. But U.S. space experts said the Russian has the wrong agency.

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More News On The U.S./Russian Satellite Collision

Satellite collision highlights space-junk threat -- Christian Science Monitor
PHOTOS: Satellite Collision Creates Dangerous Debris -- National Geographic
Pentagon fails to anticipate satellite collision -- AFP
Space-collision debris poses risk to satellites, experts say -- CBC
U.S. warns of space "dodgeball" after satellite crash -- Reuters
U.S. to release update regarding satellite debris in 72 hours: spokeswoman -- China View

Common Cold DNA Deciphered, Congestion Continues

Structure of the human rhinovirus capsid. Credit: of J.-Y. Sgro, UW-Madison

From Live Science:

Snifflers of the world rejoice: Scientists are one step closer to finding effective treatments for the common cold now that researchers have deciphered the genetic code of the ubiquitous virus.

While a full-blown cure for the common cold is not expected anytime soon, the mapping of the human rhinovirus's genetic blueprint will help scientists better understand and combat this highly contagious pathogen. In the meantime, there are always ways to help keep yourself from succumbing to the coughs and congestion.

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“We’ve Lost Two People In My Family Because You Dickheads Won’t Cut Trees Down…”

After suffering court action that cost the family $100,000, Liam Sheahan believes clearing trees saved his home and his family. Photo: Paul Rovere

From Watts Up With That?:

I’m no stranger to wildland fires. Longtime readers may recall that my own home had the threat of wildfires here in Chico, California this past summer, as did many Butte County residents who not only were threatened, but lost homes.

The recent fires in Australia and the loss of life and property were apparently compounded by a draconian policy that prevented people who lived in the fire threat zones from cutting trees and brush near their properties. We witnessed something equally tragic in Lake Tahoe fire in 2007, owing to similar eco driven government stupidity forcing heavy handed policies there. Residents couldn’t get permits to cut down brush and trees, the result was a firestorm of catastrophic proportions.

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Unseen Dark Comets 'Could Pose Deadly Threat To Earth'

'Dark' comets happen when the water on their surface has evaporated,
causing them to reflect less light Photo: GETTY

From The Telegraph:

Unseen "dark" comets could pose a deadly threat to earth, astronomers have warned.

The comets, of which there could be thousands, are not currently monitored by observatories and space agencies.

Most comets and asteroids are monitored in case they start to travel towards earth.

But Bill Napier, from Cardiff University, said that many could be going by unnoticed.

"There is a case to be made that dark, dormant comets are a significant but largely unseen hazard," he said

Scientists estimate that there should be around 3,000 comets in the solar system, but only 25 have so far been identified.

"Dark" comets happen when the water on their surface has evaporated, causing them to reflect less light.

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Why Sleep Is Needed To Form Memories

The world as the brain sees it. Optical 'polar' maps of the visual cortex are generated by measuring micro-changes in blood oxygenation as the left eye (left panel) or right eye is stimulated by bars of light of different orientations (0-180 degrees). The cortical response to each stimulus is pseudo-colored to represent the orientation that best activates visual cortical neurons. If vision is blocked in an eye (the right eye in this example) during a critical period of development, neurons no longer respond to input from the deprived eye pathway (indicated by a loss of color in the right panel) and begin to respond preferentially to the non-deprived eye pathway. These changes are accompanied by alterations in synaptic connections in single neurons. This process, known as ocular dominance plasticity, is enhanced by sleep via activation of NMDA receptors and intracellular kinase activity. Through these mechanisms, sleep strengthens synaptic connections in the non-deprived eye pathway. (Credit: Marcos Frank, PhD University of Pennsylvania)

From Science Daily:

ScienceDaily (Feb. 12, 2009) — If you ever argued with your mother when she told you to get some sleep after studying for an exam instead of pulling an all-nighter, you owe her an apology, because it turns out she's right. And now, scientists are beginning to understand why.

In research published recently in Neuron, Marcos Frank, PhD, Assistant Professor of Neuroscience, at the University of Pennsylvania School of Medicine, postdoctoral researcher Sara Aton, PhD, and colleagues describe for the first time how cellular changes in the sleeping brain promote the formation of memories.

"This is the first real direct insight into how the brain, on a cellular level, changes the strength of its connections during sleep," Frank says.

The findings, says Frank, reveal that the brain during sleep is fundamentally different from the brain during wakefulness.

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Could Someone Really Teleport Out of Jail?: Fringe Fact vs. Fiction

From Popular Mechanics:

David Robert Jones is back causing mayhem. In last night's episode of Fringe, "Ability," the villainous mystery man tries to kill with an affliction that causes hyperactive scar tissue, which closes all the victim's orifices, so they can't breathe. But to execute his murderous plan, he needs to first spring himself from a German prison using a fantastically sci-fi weapon (a stolen design from our mad scientist, Walter Bishop): a disintegration-reintegration ray. This scenario may be equal to the standard of truth-stretching that we know and love in Fringe—neither Mr. Jones nor any other person will be teleported from place to place anytime soon. But there is a bizarre real-life analogue for this Star Trek tech. Just as when bank robbers walked through walls in "Safe," four episodes ago, Fringe borrows from weird phenomena that actually happen at the quantum level. Then, it was quantum tunneling, but this week it's something just as odd: quantum teleportation.

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