Pablo Ross of the University of California, Davis, inserts human stem cells into a pig embryo as part of experiments to create chimeric embryos. Rob Stein/NPR hide caption

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Rob Stein/NPR

NIH Plans To Lift Ban On Research Funds For Part-Human, Part-Animal Embryos

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Scan of an armored poacher, Xeneretmus triacanthus. UW Collection/Courtesy of Adam Summers hide caption

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UW Collection/Courtesy of Adam Summers

From 'The Water's Edge To The Cutting Edge': Fish Skeletons, CT Scans And Engineering

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Joe Palca (left) with Jim Allison (second from right) and friends, circa 1975. Allison has gone on to make landmark discoveries in science, and is still passionate about outlaw country music. Joe Palca/NPR hide caption

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Katherine Du/NPR

Kit Parker's Story Part I

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"Danger, Will Robinson!" The danger-sensing abilities of the newly developed robot system far exceed those of the Robot in the classic TV series Lost in Space. Bettmann Archive hide caption

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Bettmann Archive

Female Drosophila bifurca flies have an organ to store sperm (right) that male flies compete to fill, crowding out rivals. Scott Pitnick/Nature hide caption

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Scott Pitnick/Nature

For Female Fruit Flies, Mr. Right Has The Biggest Sperm

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Jeannie Phan for NPR

In Search For Cures, Scientists Create Embryos That Are Both Animal And Human

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Women only got top billing in 37 percent of medical studies published in leading journals over the past two decades. Tom Werner/Getty Images hide caption

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Tom Werner/Getty Images

Top Medical Journals Give Women Researchers Short Shrift

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The researchers were inspired by working with ultramarathoners, who can be sidelined by blisters despite years of training. These runners competed in the 2007 Badwater Ultramarathon in Death Valley, Calif. Chris Carlson/AP hide caption

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Chris Carlson/AP

Human sacrifice helped solidify systems of social hierarchy, according to a new study of traditional cultures in the Pacific Ocean. Here, an engraving shows English explorer James Cook witnessing a human sacrifice ritual in Taihiti in the 1770s. The image comes from the 1815 edition of Cook's Voyages. Universal Images Group/Getty Images hide caption

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Emotion seemed to fuel plenty of sighs by Humphrey Bogart's character Rick (right) in the 1942 film classic Casablanca, and even Rick's good friend Sam, played by actor Dooley Wilson, couldn't console him. Archive Photos/Getty Images hide caption

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When so-called senescent cells were removed from mice, they were healthier and lived longer than mice that still had the cells. Philippe Merle/AFP/Getty Images hide caption

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Philippe Merle/AFP/Getty Images

Boosting Life Span By Clearing Out Cellular Clutter

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