The skin of the golden poison dart frog, Phyllobates terribilis, secretes a deadly poison that might lead to a better understanding of how to treat malfunctions of the human nervous system. Tambako the Jaguar/Getty Images hide caption
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Jeffrey Iliff (left), a brain scientist at Oregon Health & Science University, has been studying toxin removal in the brains of mice. He'll work with Bill Rooney, director of the university's Advanced Imaging Research Center, to enroll people in a similar study in 2016. Courtesy of Oregon Health & Science University hide caption
Once the roots of the Eskimo potato got too tough to eat, Christopher McCandless started collecting the seeds in a plastic bag, says author Jon Krakauer. Photo courtesy of McCandless family hide caption