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A mphibians may not seem the hardiest of creatures, but they have roamed Earth for 360 million years—a span including at least two major Ice Ages and four warming, interglacial periods. Yet their(More)
780 NATURE | VOL 433 | 17 FEBRUARY 2005 | www.nature.com/nature N umbers don’t lie. Worldwide, PhDs are most often obtained between the ages of 26 and 33. Tack on the series of postdoc positions(More)