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6 March 2014 1:04 pm ,
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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...
Magdalena Koziol, a former postdoc at Yale University, was the victim of scientific sabotage. Now, she is suing the...
- 6 March 2014 1:04 pm , Vol. 343 , #6175
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ScienceShot: A Shark's Nasal Radar
10 June 2010 1:46 pm
Even in a churning, turbulent ocean, sharks can sniff out the faint scent of prey from several kilometers away. How they do it has been a mystery. Now, a new study published online today in Current Biology suggests a strikingly simple answer: Sharks compare which nostril receives a scent molecule first and then turn in that direction. Researchers fitted the smooth dogfish shark, Mustelus canis, with a headpiece that can dispense squid odor to either nostril at set delays. The researchers found that when they sprayed the odor into the sharks' nostrils at slightly different times, the sharks turned in the direction of the earlier spritz, which keeps the shark pointed toward the odor's trail. The finding could explain the hammerhead's odd head shape, as wider-set nostrils could help better triangulate prey.
See more ScienceShots.