Doing large studies of marijuana's potential as medicine means getting it removed from an official federal list of substances with no official medical use—which requires more proof of its potential as medicine.

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Red blood cells retain a memory of high-altitude exposure, allowing for faster acclimation next time. But that memory fades within four months. Christopher Intagliata reports. 

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Properly fermented foods deliver probiotics that could help cut disease risk, said a researcher at the annual meeting of the AAAS.

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In urban Asian areas myopia among teenagers is topping 90 percent—but foresight may be able to bring those numbers way down.

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Guppies exposed to predators tend to aggregate into smaller, more tightly knit groups, which may allow them to coordinate their predator avoidance strategies. Jason G. Goldman reports.

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Astronauts’ gray matter is compressed by time in space—except in an area that controls feeling and movement in the legs. Karen Hopkin reports.

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Researchers and administrators at the CDC dare not utter the words guns or firearms for fear of budget cuts from Congress, according to health policy researcher David Hemenway.

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Critters living more than six miles below the ocean surface contain high levels of harmful compounds like PCBs and flame retardants. Julia Rosen reports.

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Researchers have developed a heat sensor that can detect temperature changes of just ten thousandths of a degree Celsius—comparable with the sensitivity of pit vipers. Christopher Intagliata reports.

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Astrophysicist and author Mario Livio writes in the journal Nature and talks to Scientific American about the recently rediscovered essay by Winston Churchill that analyzed with impressive scientific accuracy the conditions under which extraterrestrial life might exist.  

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