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6 March 2014 1:04 pm ,
Vol. 343 ,
Magdalena Koziol, a former postdoc at Yale University, was the victim of scientific sabotage. Now, she is suing the...
Antiretroviral drugs can protect people from becoming infected by HIV. But so-called pre-exposure prophylaxis, or PrEP...
Two studies show that eating a diet low in protein and high in carbohydrates is linked to a longer, healthier life, and...
Considered an icon of conservation science, researchers at World Wildlife Fund (WWF) headquarters in Washington, D.C.,...
The new atlas, which shows the distribution of important trace metals and other substances, is the first product of...
Early in April, the first of a fleet of environmental monitoring satellites will lift off from Europe's spaceport in...
Since 2000, U.S. government health research agencies have spent almost $1 billion on an effort to churn out thousands...
- 6 March 2014 1:04 pm , Vol. 343 , #6175
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Video: Steering With Light
5 December 2010 1:00 pm
Solar sails, like that unfurled by the IKAROS spacecraft this summer, catch photons from the sun the same way a boat sail catches the wind. But because these sails are large, rigid, metal structures, they are difficult to steer. Now physicists have found a way to better control them. The team shined a 130 milliwatt beam of light on a 10 micrometer-long, wing-shaped piece of glass floating in water. Because glass bends light, a property known as refraction, the wing moved perpendicular to the light rays at a rate of a few micrometers per second, as seen in this video. Adding wings made of glass or other refractive materials in flight would allow astronomers to better steer future space missions, the team reports online today in Nature Photonics. So a craft won't be stuck if it needs to make a U turn.
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