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Monday, December 22, 2008

The Biggest Scientific Breakthroughs of 2008

By LEE DYE

The year 2008 closes with two enormous scientific and technological challenges unresolved: How to create renewable and benign sources of energy and how to lessen the damage we're doing to the global climate system.

Scientific breakthroughs of 2008

Those twin issues are the "greatest challenge facing modern science," according to Nobel laureate Steven Chu, the gifted physicist who has been nominated to head the Department of Energy. He will be at the center of the effort to deal with these vexing problems, and his nomination signals a new day in that effort.

Clearly, those two issues dominated the world of science during 2008, a year that also saw much progress in fields as diverse as genetic engineering, the imaging of new planets outside our solar system and the maturing of social media that has altered everything from how we meet people to financing a costly and victorious campaign for the presidency of the United States. It's difficult to pick a single scientific achievement that stands out above all others because science, as a whole, doesn't work that way.

Science is and always will be a work in progress. Discoveries today are built upon past discoveries as progress is achieved, inch by inch. But rarely has there been a year when two inseparable issues dominated so much of our lives.


Energy and climate moved science from the lab to our living rooms and they were the "hot button" scientific issues of 2008.

The "breakthrough" in this case is not just hardware; it's a growing understanding of the urgency in solving these critical problems. Here's our list of the top 10.

Energy and Climate Change

The year the earth stood still. Polluted air, a lopsided dependence on shaky sources of foreign oil and congested highways couldn't convince Americans that it was time to get serious about new sources of energy. But more than four bucks per gallon at the gas pump did the trick.


Biofuels, hybrids and photovoltaic cells slipped into our conversations like invaders from another planet. Progress was reported from all areas of energy production but not all roads led us closer to energy independence. Corn isn't going to replace gasoline. That may be the most important energy "discovery" in 2008. Corn displaces agricultural land normally used for food production and, according to one study, it takes about 28 gallons of water to produce enough biofuel from corn to push a car just one mile. Substitute water wars for gas wars.

That disappointment grew out of research that was dictated by funding. Washington thought corn was a good idea and that's where a lot of research funds went. It should be the other way around. Let discoveries chart the course; let the funding follow. Stay fluid.

Throughout the year, discoveries flowed in from hundreds of labs: wearable electronic circuits that can use body movements to recharge batteries; solar panels so flexible they can be "painted" on a roof; photovoltaic cells that are twice as effective at converting sunlight to electricity; and a new generation of fuel-efficient vehicles.

The Sun Is Rising

Construction is under way on new wind farms, with huge turbines generating electricity from the passing breeze, and vast acreage is being converted to solar collectors. Scientists at several institutions made progress in creating a way to store solar energy by using solar power to split water into oxygen and hydrogen and using the hydrogen as fuel.

It took a long time but the sun is finally rising as our most promising source of clean, sustainable energy.

Cells, a New Beginning

Scientists achieved several goals in what was once thought impossible -- reprogramming adult cells to act as stem cells, morphing into new cells. That progress, labeled by Science magazine as the "breakthrough of the year," could potentially solve two huge problems.

A Really Big Machine

The grandest new toy to go online in 2008 is the Large Hadron Collider, a 17-mile-long, ring-shaped particle accelerator on the French-Swiss border meant to recreate the conditions during the first instant after the Big Bang. The machine, built by 26 nations for $8 billion, gives scientists their best chance yet to find the postulated Higgs boson or so-called "God particle," which is believed to be the particle that gave mass to all other particles. But every new accelerator, erroneously referred to as atom smashers, seems to come with its own agenda. Who's to say, at this point, what the Hadron will tell us about the beginning of the universe?

Unfortunately, the collider had to be shut down after operating a few days in September because it sprang a helium leak. It is scheduled to be operational again in June. But, fortunately, it didn't do what some folks feared it might -- create black holes that could destroy the earth. Physicists have tried to dehorn that myth, noting that particle collisions happen naturally all the time and the planet is still here.

Social Media

Here's a newcomer to the annual year's top 10 list, and it slipped in so quietly that a lot of lists missed it entirely.

Some of its components have been around for awhile -- Facebook, YouTube, Twitter, etc. -- but during 2008 they took center stage, changing the way many of us interact and providing vital information during disasters ranging from fires to warfare to terrorism.

Social Networking Here to Stay

This year, it helped President-elect Barack Obama make history, raising enough money from millions of citizens to finance a successful campaign for the presidency. Obama used the new kid on the block, Twitter, to keep his followers informed and, of course, to lift a little change out of their pockets.

Social networking is here to stay and several sites remain the hottest on the Internet. Earlier this month. Google reported that four of the 10 "fastest-rising" search terms in 2008 were for social-networking sites, including three in Europe -- Facebook login (3), tuenti (4), nasza klasa (7) and wer kennt wen (8).

Dead Mice Resurrected

Geneticists in Japan cloned dead mice that had been frozen for 16 years and produced 13 healthy, live mice. The breakthrough suggests that it may be possible to bring back extinct animals, like the wooly mammoth, that have been dead and frozen for some time, a feat that was once thought impossible. This process relied on transferring the nuclei from dead cells drawn from the brains and blood of the dead mice and injecting just that part into unfertilized mouse eggs, creating embryos.

But it will be difficult to resurrect animals that have been dead for a long time, the scientists said in announcing their discovery, because cells from dead animals decay quickly, even if frozen.

It's not quite Jurassic Park but maybe it's a step in that direction.

Spacewalk, Made in China

Low earth orbit isn't exactly crowded but it grew a little tighter this year when a Chinese astronaut took a 15-minute spacewalk outside the Shenzhou VII capsule 213 miles above the Earth. It was China's third manned venture into space, and the country plans to launch its own space station in a little more than a decade.

China is now recruiting more astronauts -- or "taikonauts" in Chinese lingo -- for future missions.

Planets, Anyone?

Discovery of new planets outside our solar system came in rapid fire during 2008 and, for the first time, astronomers were able to image several planets, not just infer their existence from various clues. New telescopes, and new techniques, revealed huge planets orbiting at great distances from their stars, so none of them are likely to harbor life as we know it. But it was a significant milestone in the search for whatever, or whoever, is out there.

Previously, astronomers relied on faint movements of the stars from the gravitation of an orbiting planet, called the wobble effect, as one means of finding planets. They could also measure the slight dimming of a star when a planet passed between the star and the earth. But neither of these techniques allowed them to actually see the planets, which were too dim to be seen near a brilliant star. Now, they can begin analyzing their data to learn more about the planets' atmosphere and, thus, more about whether they could sustain life.

None of the exoplanets imaged so far are likely candidates but maybe someday ...

Can You See Me Now?

Invisibility Cloaks on the Horizon

Have you ever wished you could be invisible, a fly on the wall that no one could see? Well, stay tuned.

Some clever researchers at the University of California, Berkeley, say they are close to inventing a "cloak of invisibility" that can deflect anything that travels as a wave, like light and sound. You can't see it, you can't hear it, how you going to know it's there?

This magic resulted from the creation of new substances, called metamaterials. The surface has incredibly tiny structures that are small enough to interfere with individual waves. If you were cloaked in such material, light waves would bend around you and meet up on the other side. You would have disappeared without a clue.

The technology could have many practical applications, some of which are obvious. Think stealth bomber.

Life on Mars?

Not yet, at least not that we know of. But NASA's intrepid spacecraft Phoenix, cobbled together partly with some leftover parts at a paltry cost of $420 million, showed once and for all that there is ice beneath Mars' north pole. That increases the possibility that there is, or at least was, life somewhere on the Red Planet, because water is essential for life as we know it.

Phoenix wasn't exactly looking for life but months of poking and digging and analyzing produced some reason for hope. The small craft found salts and clays, which require water to form, and it dug up ice crystals from the red soil.

Because of the planet's varying distances from the sun, and its tilted axis, the polar regions do warm up about every million years or so, making those areas more suitable for life. Even a microbe would be a welcome sight.

Your Genome, Cheap

DNA guru James Watson had his entire genome sequenced. It took a couple of months and cost only about $1 million. Now, it seems, everybody wants to get into the act.

A number of companies began offering genome sequencing, and the cost dropped to about $200,000. Still others opened shop, offering an abbreviated profile that would search for a wide range of potential illnesses for a few hundred dollars. But health authorities across the country became alarmed because of the potential for mistakes and difficulty in interpreting what the findings actually mean, and regulatory agencies leaped into action with new and proposed rules.

So at the moment it's not clear how available any of these services are likely to be but it's probably only a matter of time. At least we would know more about what to dread, even if we can't cure it yet.

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Remarkably Bright White Light Given Off When Diaper Rash Cream Concoction Is Heated To High Temperature


Glowing sulfur-doped ZnO phosphor emitting white light. (Credit: John Foreman (Redstone Arsenal))

Duke University and United States Army scientists have found that a cheap and nontoxic sunburn and diaper rash preventative can be made to produce brilliant light best suited to the human eye.

Duke adjunct physics professor Henry Everitt, chemistry professor Jie Liu and their graduate student John Foreman have discovered that adding sulfur to ultra-fine powders of commonplace zinc oxide at about 1,000 degrees centigrade allows the preparation to convert invisible ultraviolet light into a remarkably bright and natural form of white light.

They are now probing the solid state chemistry and physics of various combinations of those ingredients to deduce an optimal design for a new kind of illumination. Everitt and Liu have applied for a patent on using the preparations as a light source. "Our target would be to help make solid state lighting with better characteristics than current fluorescent ones," said Everitt, who also works with Foreman at the Army's Redstone Arsenal in Huntsville, Ala.

The researchers said they are producing white light centered in the green part of the spectrum by forming the sulfur-doped preparation into a material called a phosphor. The phosphor converts the excited frequencies from an ultraviolet light emitting diode (LED) into glowing white light.

Nanometer-diameter zinc oxide powders are being prepared by Liu's research group, which focuses on the chemistry of nanomaterials. He is Duke's Jerry G. and Patricia Crawford Hubbard Professor of Chemistry. They are then being tested at the Aviation and Missile Research, Development and Engineering Center at Redstone Arsenal by Everitt, an Army senior research scientist, and Foreman, an Army research physicist.

The researchers are also exploring using electricity alone to trigger the visible emissions without need for an ultraviolet light trigger.

The Army has selected the project for priority funding through a competitive In-house Laboratory Independent Research program because of its potential advantages as an energy efficient and safe illumination source.

"One of the objectives is to give soldiers efficient lighting that doesn't run their batteries down," Everitt said. "They need efficiency, brightness, longevity and ruggedness, and this helps with all of those things."

Existing commercial LEDs are already rugged enough to be used in bumper-mounted brake lights, Everitt said.

"They are good enough for decoration and for use in traffic lights, but they don't make good reading lights because they are not of a white color that our eyes use best," Liu said. White LEDs on the market now are costly, short-lived and not truly white, the researchers added.

A compound that can be used on faces or babies' bottoms also has major safety advantages over fluorescent bulbs, which happen to contain toxic mercury. "If a fluorescent bulb gets broken in the course of battle, it exposes soldiers to that mercury in addition to its shattered glass," Everitt said.

"I think the biggest payoff for the general public will ultimately be in future energy crises we're certainly going to face," Everitt added. "If we can have more efficient lighting it will reduce our energy requirements."

Scientists have long known that zinc oxide can itself serve as a solid state ultraviolet light source. They have also known that adding sulfur allows it to emit some white light. But Liu, Everitt and Foreman are investigating how nanostructuring and doping improves its performance.

The introduced sulfur is thought to boost wavelength conversions from ultraviolet to visible wavelengths by serving as an "impurity" that changes the chemistry and physics of the zinc oxide in ways the Duke researchers are still probing.

Most scientists consider such impurities "defects" that interfere with zinc oxide's ability to produce a stronger ultraviolet light, they said. But "we love the defects that other people hate," Everitt said. "That's been the gift of nanostructured doped zinc oxide, emitting what your eye expects white light to look like."

In a report published May 10, 2006, in the research journal Nano Letters, Foreman, Everitt, Liu and co-researchers first disclosed they could induce a formulation of zinc oxide shaped into nanowires to absorb light from an ultraviolet laser and re-emit it as a "broadband visible emission of unprecedented brightness." The white light component was more than 1,000 times brighter than the ultraviolet component, they reported.

In a followup report, published July 2, 2007, in the journal Applied Physics Letters, the Duke researchers initiated what they expect to be a series of published papers exploring how various alterations affect the white light emissions.

"We've learned something about what makes the white light conversion happen, and what makes it happen so efficiently," Everitt said. The Duke team has already achieved efficiencies as high as 80 percent. But there are still technical issues to resolve tied to the operating temperatures of the phosphors and the power from the underlying ultraviolet LED.

"Our challenge has been getting a foundational understanding so we can understand what is physically possible and how close we are to achieving it," Everitt said.

Zinc oxide would be both a less-toxic and cheaper light source than the combinations used in today's commercial LEDs -- gallium nitride and cerium-doped yttrium oxide, they said. Cerium-doped yttrium oxide is also used in today's mercury-containing fluorescent bulbs, Everitt added.

Liu's lab originally stumbled on to the light emitting potential of sulfur-doped zinc oxide while studying its electronic conductivity. "We just lit it up with an ultraviolet laser and -- whammo -- there was a lot of white light coming out," Everitt said.

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Scientists discover new forest with undiscovered species on Google Earth

By Louise Gray, Environment Correspondent

View looking out from Mount Mabu: Scientists discover new forest on Google Earth
A British-led expedition found 7,000 hectares of forest, rich in biodiversity, known as Mount Mabu Photo: Tom Timberlake/RBG Kew

The mountainous area of northern Mozambique in southern Africa had been overlooked by science due to inhospitable terrain and decades of civil war in the country.

However, while scrolling around on Google Earth, an internet map that allows the viewer to look at satellite images of anywhere on the globe, scientists discovered an unexpected patch of green.

A British-led expedition was sent to see what was on the ground and found 7,000 hectares of forest, rich in biodiversity, known as Mount Mabu.

In just three weeks, scientists led by a team from the Royal Botanic Gardens in Kew found hundreds of different plant species, birds, butterflies, monkeys and a new species of giant snake.

The samples which the team took are now back in Britain for analysis.

So far three new butterflies and one new species of snake have been discovered but it is believed there are at least two more new species of plants and perhaps more new insects to discover.

Julian Bayliss, a scientist for Kew based in the region, discovered Mount Mabu while searching on Google Earth for a possible conservation project. He was looking at areas of land 5,400ft (1,600m) above sea level where more rainfall means there is likely to be forest.

To his surprise he found the patches of green that denote wooded areas, in places that had not previously been explored. After taking a closer look on more detailed satellite maps, he went to have a look.

An expedition was organised for this autumn with 28 scientists from the UK, Mozambique, Malawi, Tanzania and Switzerland. The group was able to stay at an abandoned tea estate but had to hack through difficult terrain and use 70 porters in order to carry out their investigations.

Within weeks they had discovered three new species of Lepidoptera butterfly and a new member of the Gaboon viper family of snakes that can kill a human in a single bite. There were also blue duiker antelope, samango monkeys, elephant shrews, almost 200 different types of butterflies and thousands of tropical plants.

Jonathan Timberlake, expedition leader, said digital imagery has helped scientists to discover more about the world. He believes there may be other small pockets of biodiversity around the world that are yet to be discovered that could be stumbled upon by searching on Google Earth, especially in areas like Mozambique or Papua New Guinea which have not been fully explored yet.

Mr Timberlake said discovering new species is not only important to science but helps to highlight conservation efforts in parts of the world threatened by logging and development.

Mount Mabu itself is under threat as Mozambique's economy grows and people use the wood for fuel or clear the land to grow crops.

"We cannot say we have discovered all the biodiversity areas in the world, there are still ones to discover and it helps to find new species to make people realise what is out there," he said.

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Beer goggles last longer for women

By Roger Dobson

Beer goggles last longer for women
Women who drink develop a reduced ability to rate attractiveness in male faces Photo: ANDREW CROWLEY

Researchers found that women who drink even moderately develop a reduced ability to rate attractiveness in male faces, even when they are sober.

Those who drank were less able to detect male facial symmetry, a marker of attractiveness and good genes which is thought to play an important role in the choice of a partner.

In the research, young women classed as typical, non-alcoholic drinkers - who have up to 40 drinks a month - were put through a number of tests, including an exercise on facial symmetry.

In this test, the 45 women were presented with 60 pairs of male faces. One in each pair was more symmetrical than the other and the women had to identify it in each of the pairs.

Results show that the more alcohol the women had drunk during the previous six months, the lower her performance on the symmetry test.

Even women who had the equivalent of five drinks a month scored less in the test than those who had no drinks. Each additional drink led to a reduced score.

Dr Kirsten Oinonen, of Lakehead University, in Canada, said: "My study suggests that sober women who drink alcohol are less able to perceive facial symmetry when sober.

"When sober, these women are worse at judging facial symmetry, and therefore may find less attractive men more attractive. Given that symmetry is associated with attractiveness of faces, my study does suggest the possibility that alcohol intoxication may decrease facial symmetry perception, and make people look more attractive.

"This is the first study to look at this issue. It suggests that as typical alcohol consumption increases in young women, facial symmetry perception performance decreases."

The researchers say the results suggest alcohol has a long term effect on the brain. They believe it may effect the brain's structure in some way, reducing its visual perception abilities. But it is not known how long term the effects are or whether they are permanent.

"Whether or not any damage or deficits are permanent is hard to tell at this point," Dr Oinonen added.

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New York City To Get LED Street Lighting

250,000 Tiny Greenhouses, Each Containing One Head of Lettuce

Posted by Alexis Madrigal

lettuce-lamps-sm

The homefront during the world wars is a great place to look for strange technology and new social practices.

So, permit me a brief digression from green tech into the gender-bending agricultural and industrial story of Britain during the war told in the pages of the aforementioned 1918 National Geographics.

Judson Welliver tells us, “Everybody knows how British women have taken the places of men in industry, but nobody who has not seen can understand.”

Indeed the photos from the article are stunning. Hearty British “lumberjanes” sawing and cutting. A misty meadow of sheep attended by a “shepherdess”. The names themselves are strange, sort of like women’s college basketball team mascots: The Lady Vols, or what have you.

The most shocking photo, though, shows British women tending to 250,000 bell jars, each growing a single head of lettuce. These mini-greenhouses allowed the British to keep producing vegetables at a time when their fields would have normally lain dormant. (A larger version)

The caption reads, “UNDER 250,000 IMMENSE GLASS BELLS THIS GROUP OF WOMEN WAR WORKERS IS HELPING TO RAISE FOOD FOR GREAT BRITAIN.”

It continues:

The scene is Burhill Intensive Gardens, at Horsham, where, in compliance with the British Government’s instructions, every available inch of space is being utilized to supply British troops and civilian population with food. Under this sea of bells a quarter of a million heads of lettuce are cultivated.

Apparently this worked quite well, as Welliver tells us that in 1918, Britain “has produced foodstuffs enough to feed it for 40 of the 52 weeks,” a feat not accomplished for more than 50 years. All that food growing, though, left its mark on the land:

Sacred parks and beloved areas of grass lands have been sacrificed; but the food was produced, because there were no ships in which to import it. Not again will Britain permit itself to be dependent for its daily bread on the uncertainties of importation… The 1918 achievement would not have been so striking in normal conditions as to labor, animals, implements, fertilization, and the like; but in the circumstances of its accomplishment it is one of the war’s wonders.

Let’s leave aside for a minute all the gender stuff and just contemplate a group of people waking up in the morning for their first day at their new job, walking down the road to what used to be their favorite park, where they once strolled looking for cute boys, and seeing this “sea of bells.” This is not a field, it’s government projects for a species of plant; each and every lettuce head gets its own house to further its development and speed its way into the mouths attached to the system. And where’d they get all those Bell Jars?

That lettuce must have felt like the most special lettuce in the whole world, at least until it was plucked and boiled and eaten. Another reason to fear for your life if you find yourself living in a glass house.

It’s also sad that a quick search for “Burhill Intensive Gardens” — clearly one of the more insane experiments in agriculture you’re likely to find — comes up with a whopping 0 results. This is a PhD dissertation waiting to be written! The Bell jar and the Lettuce: An exploration at the intersection of solar energy, war, gender, and agriculture. (Perhaps this is my second book?)

Here’s the first place to look for more information: the full-text version of this 1909 book about the gardeners of Paris. Apparently, Parisian urban gardeners employed the bell jars — called cloches — to protect their plants and raise salad greens early in the season. The book, first published in 1909, was designed as a practical guide to “intensive” farming the French way. Voila:

cloches

A promoter of this system, quoted in the book, had this to say to his British compatriots about the French and their stinkin’ cloches:

We have several important things to learn from the French, and not the least among these is the winter and spring culture of salads inasmuch as enormous quantities of these are sent from Paris to our markets during the spring months… The fact that we have to be supported by our neighbours with articles that could be so easily produced in this country is almost ridiculous. It is impossible to exaggerate the importance of this culture for a nation of gardeners like the British ; and if it were the only hint that we could take from the French cultivators with advantage, it would be well worth consideration.

It might have taken a world war, but the British got with the Francoculture, even if they appear to have abandoned it in later years.

Now, we can (sort of) return to our story, picking up the thread of the bell jar in agriculture with this article on “American intensive solar gardening,” written by a couple of hippy homesteaders, Leandre Poisson and Gretchen Vogel Poisson, in the 90s:

In 1976 Lea conceived of a gardening device that met all of his design requirements: it was inexpensive, easy to build, and used resources and energy wisely. We christened this device the Solar Pod. That fall we prepared a bed and planted it with lettuce, but we didn’t place the Pod on the bed until February. When we shoveled off the snow and uncovered the bed, which we had protected with a scrap of fiberglass, to our surprise the lettuce still looked green and edible underneath all that snow.

After we set the Pod in place, we were amazed by how the soil under it heated up and how the lettuce grew . . . and grew, and grew. It was quite possible the most photographed lettuce in history. Friends came to see the experiment, and they mentioned to us that the Pod reminded them of intensive gardens in France. The following winter we discovered several books on French intensive gardening, or what the French call the Marais system.

Eventually Lea designed what he thought of as a better cloche, too. He made it out of a material called “Sunlite,” produced by the Kalwall Corporation, that was a “solar-friendly, fiberglass-reinforced plastic sheet glazing material.” They wrapped it into a cone, leaving a hole at the top, and stuck it in the ground around the plants. “The best and final configuration, coincidentally or not, resembles the profile of the great pyramids,” they write. “We christened this lightweight modern cloche the Solar Cone.”

Next thing they knew, their plants were going wild. “The hole on the top permitted the necessary gas exchange of carbon dioxide and oxygen, but inside each cone the environment resembled a miniature rain forest,” they surmised. All their success — and some appearances on the New England lecture circuit — got them thinking that maybe they’d actually come up with something new, a distinct American variety of an old European practice:

As we distilled and further refined our gardening system over the next decade, we began to realize that we were not longer translating the French system to America. We were in the process of developing our own unique system - a simple, state-of-the-art, flexible, and continuously productive method of growing food on very little land - which we named “American intensive gardening.”

While defining their agricultural system, they might have also hit upon the best short description of the mythical American: “simple, state-of-the-art, flexible, and continuously productive.”

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