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

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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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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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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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