U.S. Scientists Learn How To Levitate Tiny Objects

Photo: An artist's rendition shows how the repulsive Casimir-Lifshitz force between suitable materials in a fluid can be used to quantum mechanically levitate a small object of density greater than the liquid. (Courtesy of the lab of Federico Capasso, Harvard School of Engineering and Applied Sciences/Handout/Reuters)

From Yahoo News/Reuters:

CHICAGO (Reuters) – U.S. scientists have found a way to levitate the very smallest objects using the strange forces of quantum mechanics, and said on Wednesday they might use it to help make tiny nanotechnology machines.

They said they had detected and measured a force that comes into play at the molecular level using certain combinations of molecules that repel one another.

The repulsion can be used to hold molecules aloft, in essence levitating them, creating virtually friction-free parts for tiny devices, the researchers said.

Federico Capasso, an applied physicist at Harvard University in Massachusetts, whose study appears in the journal Nature, said he believed that detection of this force opened the possibility of a whole new class of tiny gadgets.

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What Science Says About Enlightened Sex By Sally Law, Special to LiveScience

Women who practiced the Eastern techniques of mindfulness and yoga reported improvements in levels of arousal and desire, as well as better orgasms. Image credit: Dreamstime

From Live Science:

Another year, another batch of resolutions: eat right, exercise more, pay bills on time etc. All good in theory, but potentially dull in practice.

In 2009, then, resolve to have better sex. According to a recent review article in the Dec. 3 issue of The Journal of Sexual Medicine, sexually unsatisfied women who practiced the Eastern techniques of mindfulness and yoga reported improvements in levels of arousal and desire, as well as better orgasms. In addition, yoga has been found to effectively treat premature ejaculation in men.

Eastern practices have been touted as sexually beneficial for years — as the article states, the techniques have "their origin in the Kama Sutra of the fourth to sixth centuries."

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Breakthroughs That Will Change Everything

From Live Science:

Will humans go extinct? Or will we instead evolve into divergent species? Can we stop killing each other? Perhaps old-fashioned wisdom will return and save the day.

These are just some of the compelling thoughts generated when the forward-thinking Edge Foundation recently asked scientists, authors, futurists, journalists and other offbeat thinkers the question: "What will change everything?" To refine the question, Edge further asked: "What game-changing scientific ideas and developments do you expect to live to see?"

Among the dozens of responses, from such diverse sources as Alan Alda (actor and now TV science personality) to Ian Wilmut (cloned Dolly the sheep), LiveScience picked out five, each notable for its ingenuity and ability to provoke thought.

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Is Anybody In Charge Of Keeping Satellites From Colliding?

From The Straight Dope:

Dear Cecil:

As I stare into the beautiful dark sky above my home in Hawaii and see all the stars and satellites, I ponder the possibility of "space accidents." With all those satellites up there, are there any collisions? I don't suppose anybody is handing out OUIs (for orbiting under the influence), but how do they decide what satellite should go where? Who oversees all those orbits? Is it just a stellar free-for-all?

— Roy Orbits Son

Cecil replies:

No, but it's not iron discipline either. To date we've been content to let just about anybody heave stuff into orbit, requiring only minimal reporting for most launches. But with increasing commercialization of space, things are starting to get crowded up there — the Union of Concerned Scientists lists 898 active satellites, operated by everybody from the U.S. to Luxembourg. Given the vastness of space, even in earth's immediate vicinity, it's not like we're talking bumper-to-bumper traffic.

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73.4 Percent of All Wikipedia Edits Are Made By Roughly 1,400 People

From College On The Record:

Most college professors discourage students from using Wikipedia as a reliable source of information, and if you’ve ever wondered why, here is the reason:

There are millions of people who browse Wikipedia in any given month, but only 2 percent of them (roughly 1,400) are responsible for editing nearly 75 percent of the information on the entire website.

In other words, Wikipedia, while editable by anyone, is fueled almost entirely by the knowledge of a small, select group of individuals.

Consider them the Illuminati of Wikipedia; they control the flow of information that often finds its way into our college essays, despite our professors’ best attempts to dissuade us from citing it.

The source of this startling revelation? The face of Wikipedia, Jimbo Wales.

But, [Wales] insisted, the truth was rather different: Wikipedia was actually written by "a community ... a dedicated group of a few hundred volunteers" where "I know all of them and they all know each other". Really, "it's much like any traditional organization."

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Diamonds Offer 'Final Proof' That A Comet Wiped Out The Mammoth

From Times Online:

Sure, 2008 was bad. But for Americans it was nowhere near as bad as 11,000BC – according to research published in Science magazine yesterday.

At about that time, say scientists, a massive comet struck the atmosphere somewhere above North America, broke into pieces and rained down fire and death – wiping out the early Palaeo-Americans, also known as Clovis people, and making creatures such as the woolly mammoth, mastodon, short-faced bear, sabre-toothed cat, ground sloth and giant armadillo extinct. Not to forget the American camel and the American lion.

Although this theory first emerged a year ago and has been hotly debated ever since, the authors of the Science article present compelling evidence to support it – in the form of nanodiamonds.

These, which are so small they are barely visible even under the most advanced microscopes, have been found embedded in 13,000-year-old sediment in North America and Europe. The only plausible explanation for this, say the authors, is a planetary catastrophe of the sort that bade farewell to the dinosaurs about 65 million years earlier.

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LIFE Photo Archive Hosted By Google

From Google:

Search millions of photographs from the LIFE photo archive, stretching from the 1750s to today. Most were never published and are now available for the first time through the joint work of LIFE and Google.

My Comment: An incredible collection of Life photos that can be easily searched and/or browsed through.

The link is HERE.

Top 5 Incredible Science Discoveries of 2008

From Live Science:

Science is mostly an incremental process, a slow peeling of the onion to offer small glimpses of understanding. But over time, scientists remove enough layers to expose stunning truths about nature.

This year offered some intriguing revelations along these lines. Below are the top 5.

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The Top 10 Green-Tech Breakthroughs Of 2008

From Wired News:

Green technology was hot in 2008. Barack Obama won the presidential election promising green jobs to Rust Belt workers. Investors poured $5 billion into the sector just through the first nine months of the year. And even Texas oilmen like T. Boone Pickens started pushing alternative energy as a replacement for fossil fuels like petroleum, coal and natural gas.

But there's trouble on the horizon. The economy is hovering somewhere between catatonic and hebephrenic, and funding for the big plans that green tech companies laid in 2008 might be a lot harder to come by in 2009. Recessions haven't always been the best times for environmentally friendly technologies as consumers and corporations cut discretionary spending on ethical premiums.

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If Climate Didn't Doom Neanderthals, Did Humans?

A map of Europe and part of the Middle East depicts the approximate range of the Neanderthals as provided by Richard Klein. The illustration below demonstrates some of the differences in the skulls between Neanderthals and Cro-Magnons. Illustration copyright Richard Klein (Image from National Geographic)

From Wired News:

Neanderthals could handle the weather, but they couldn't handle us, concludes a new analysis of late-Pleistocene hominid habitation.

Soon after modern humans arrived in Western Europe, plenty of temperate, food-rich habitat existed for our evolutionary near-brothers — but their settlements dwindled, and modern human settlements spread.

These patterns suggest that one of modern anthropological history's great mysteries had a harsh ending: a competition in which Neanderthals, for reasons still unknown, were doomed.

"Neanderthals didn't end up being the champion lineage that emerged from the end of the Pleistocene," said study co-author A. Townsend Peterson, a Kansas University evolutionary biologist. "Wouldn't it be fascinating to understand that weird point in human history, when there were two lineages of Homo, in the same region?"

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One World, Many Minds: Intelligence In The Animal Kingdom

Jupiterimages

From Scientific American:

We are used to thinking of humans as occupying the sole pinnacle of evolutionary intelligence. That's where we're wrong

* Despite cartoons you may have seen showing a straight line of fish emerging on land to become primates and then humans, evolution is not so linear. The brains of other animals are not merely previous stages that led directly to human intelligence.
* Instead—as is the case with many traits—complex brains and sophisticated cognition have arisen multiple times in independent lineages of animals during the earth’s evolutionary history.
* With this new understanding comes a new appreciation for intelligence in its many forms. So-called lower animals, such as fish, reptiles and birds, display a startling array of cognitive capabilities. Goldfish, for instance, have shown they can negotiate watery mazes similar to the way rats do in intelligence tests in the lab.

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Most Extreme News Stories Of 2008

From New Scientist:

It's been a year of extremes for science and technology. From camera footage of the deepest living fish, swimming some 5 miles beneath the surface of the Pacific ocean, to the creation of the smoothest ever surface - a lead and silicon film.

Here are eight more extremes that New Scientist brought you in 2008.

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Researchers Unlock Secrets Of 1918 Flu Pandemic

Policemen in Seattle wearing masks made by the Red Cross, during the influenza epidemic in a National Archives photo dated December 1918. (National Archives/Handout/Reuters)

From Yahoo News/Reuters:

WASHINGTON (Reuters) – Researchers have found out what made the 1918 flu pandemic so deadly -- a group of three genes that lets the virus invade the lungs and cause pneumonia.

They mixed samples of the 1918 influenza strain with modern seasonal flu viruses to find the three genes and said their study might help in the development of new flu drugs.

The discovery, published in Tuesday's issue of the Proceedings of the National Academy of Sciences, could also point to mutations that might turn ordinary flu into a dangerous pandemic strain.

Yoshihiro Kawaoka of the University of Wisconsin and colleagues at the Universities of Kobe and Tokyo in Japan used ferrets, which develop flu in ways very similar to humans.

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Christmas Star Mystery Continues

The fabled Star of Bethlehem (shown above in a conceptual photo) may have been a series of events with great meaning for ancient skywatchers or a single planetary conjunction, astronomers suggest. Photograph by Thomas Nebbia/NGS

From National Geographic:

In the Bible, a celestial beacon now known as the Star of Bethlehem led the Magi, or wise men, to Jesus's manger.

Astronomers have been debating for centuries whether the star existed and, if so, what it might have been. Comets, meteor showers, and supernovae have all been proposed, but in recent years two main theories have come to dominate the discussion.

The first relates to a singular planetary gathering, or conjunction, of the bright planets Venus and Jupiter. A particularly striking conjunction occurred in June 17, 2 B.C.

It makes for a probable Christmas star, some astronomers say, because the two bright planets appeared so close in the evening sky that they would have seemed to merge.

"There is no doubt that for skywatchers at the time it looked like a massive, single starlike object in the western evening sky," said Ed Krupp, director of the Griffith Observatory in Los Angeles, California.

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Julia Roberts Was Born With A Beautiful Smile

The study found faking a smirk is innate. True smiles like Roberts’ toothsome grin cause the eyes to twinkle and narrow and the cheeks to rise. Munawar Hosain / Getty Images file

From MSNBC/Live Science:

Study finds facial expressions are genetic — not learned

From sneers to full-blown smiles, our facial expressions are hardwired into our genes, suggests a new study.

The researchers compared the facial expressions from more than 4,800 photographs of sighted and blind judo athletes at the 2004 Summer Olympics and Paralympic Games.

The analyses showed sighted and blind individuals modified their expressions of emotion in the same way in accordance with the social context. For example, in the Paralympics, the athletes competed in a series of elimination rounds so that the final round of two athletes ended in the winner taking home a gold medal while the loser got a silver medal.

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Lessons For Other Smokers In Obama's Efforts To Quit

Franklin D. Roosevelt smoked cigarettes, and John F. Kennedy and Bill Clinton occasionally smoked cigars. Gerald R. Ford preferred a pipe. (Clockwise from top left: AP; Henry Griffin/AP; AP; Mark Wilson/A)

From International Herald Tribune:

Will one of President-elect Barack Obama's New Year's resolutions be to quit smoking once and for all?

His good-humored waffling in various interviews about smoking made it plain that Obama, like many who have vowed to quit at this time of year, had not truly done so.

He told Tom Brokaw of NBC several weeks ago, for example, that he "had stopped" but that "there are times where I've fallen off the wagon." He promised to obey the no-smoking rules in the White House, but whether that meant he would be ducking out the back door for a smoke is not known. His transition team declined to answer any questions about his smoking, past or present, or his efforts to quit.

Anti-smoking activists would love to see Obama use his bully pulpit to inspire others to join him in trying to kick the habit, but he has not yet taken up their cause.

The last president to smoke more than occasionally was Gerald Ford, who was quite fond of his pipes. Jimmy Carter and both Presidents George Bush were reportedly abstainers, but Bill Clinton liked cigars from time to time - though he may have chewed more than he smoked.

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Satellites Unearthing Ancient Egyptian Ruins

Photo: The enclosure wall of the Great Aten temple in Egypt, as seen from the QuickBird satellite.

From CNN:

(CNN) -- Archaeologists believe they have unearthed only a small fraction of Egypt's ancient ruins, but they're making new discoveries with help from high-tech allies -- satellites that peer into the past from the distance of space.

"Everyone's becoming more aware of this technology and what it can do," said Sarah Parcak, an archaeologist who heads the Laboratory for Global Health at the University of Alabama at Birmingham. "There is so much to learn."

Images from space have been around for decades. Yet only in the past decade or so has the resolution of images from commercial satellites sharpened enough to be of much use to archaeologists. Today, scientists can use them to locate ruins -- some no bigger than a small living room -- in some of the most remote and forbidding places on the planet.

In this field, Parcak is a pioneer. Her work in Egypt has yielded hundreds of finds in regions of the Middle Egypt and the eastern Nile River Delta.

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Burning Coal At Home Is Making A Comeback

Kyle Buck of Sugarloaf, Pa., fills a stove with anthracite coal as his wife, Kelly, plays with their daughter Lila. Laura Pedrick for The New York Times

From The New York Times:

SUGARLOAF, Pa. — Kyle Buck heaved open the door of a makeshift bin abutting his suburban ranch house. Staring at a two-ton pile of coal that was delivered by truck a few weeks ago, Mr. Buck worried aloud that it would not be enough to last the winter.

“I think I’m going through it faster than I thought I would,” he said.

Aptly, perhaps, for an era of hard times, coal is making a comeback as a home heating fuel.

Problematic in some ways and difficult to handle, coal is nonetheless a cheap, plentiful, mined-in-America source of heat. And with the cost of heating oil and natural gas increasingly prone to spikes, some homeowners in the Northeast, pockets of the Midwest and even Alaska are deciding coal is worth the trouble.

Burning coal at home was once commonplace, of course, but the practice had been declining for decades. Coal consumption for residential use hit a low of 258,000 tons in 2006 — then started to rise. It jumped 9 percent in 2007, according to the Energy Information Administration, and 10 percent more in the first eight months of 2008.

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European Neanderthals Had Ginger Hair And Freckles

The gene known as MC1R suggests the Neanderthals had
fair skin and even freckles like redheads.

From The Telegraph:

Neanderthals living in Europe were fair skinned, freckled and had ginger hair, a study has revealed.

In a major breakthrough, Spanish scientists have discovered the blood group and two other genes of the early humans who lived 43,000 ago.

After analysing the fossil bones found in a cave in north-west Spain, the experts concluded they had human blood group "O" and were genetically more likely to be fair skinned, perhaps even with freckles, have red or ginger hair and could talk.

The investigating team from Spain's government scientific institute, CSIC, used the very latest forensic techniques to remove the bones for analysis to prevent them getting contaminated with modern DNA.

Carles Lalueza, an evolutionary biologist with the investigation, said: "What we were trying to do was to create the most realistic image of the Neanderthals with details that are not visible in the fossils, but which form part of their identity."

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Natural Disasters 'Killed Over 220,000' In 2008

From Yahoo News/AFP:

BERLIN (AFP) – Natural disasters killed over 220,000 people in 2008, making it one of the most devastating years on record and underlining the need for a global climate deal, the world's number two reinsurer said Monday.

Although the number of natural disasters was lower than in 2007, the catastrophes that occurred proved to be more destructive in terms of the number of victims and the financial cost of the damage caused, Germany-based Munich Re said in its annual assessment.

"This continues the long-term trend we have been observing. Climate change has already started and is very probably contributing to increasingly frequent weather extremes and ensuing natural catastrophes," Munich Re board member Torsten Jeworrek said.

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