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In late November 2011 I went to Johannesburg, South Africa, to meet the newest member of the human family, a nearly two million–year-old creature dubbed Australopithecus sediba. First announced in 2010, its fossilized bones have caused quite a commotion in paleoanthropological circles--and with good reason. They are some of the most complete early hominins (the group that includes modern humans and their extinct relatives) ever found, and they exhibit a combination of apelike and humanlike traits that no one would have predicted.

In late November 2011 I went to Johannesburg, South Africa, to meet the newest member of the human family, a nearly two million–year-old creature dubbed Australopithecus sediba. First announced in 2010, its fossilized bones have caused quite a commotion in paleoanthropological circles--and with good reason

VIENNA (Reuters) - Japan will need to discharge a total of 11,500 tons of low-contaminated water into the ocean from the site of a stricken nuclear reactor, a senior Japanese nuclear official said in Vienna on Monday.

Japan's ongoing nuclear crisis has triggered radiation hysteria all over the world--thyroid-protecting potassium iodine pills are flying off the shelves in the U.S, Geiger counters are selling out in Paris, and all of a sudden, everyone seems to care how close they are to a nuclear plant. Enter RDTN , a crowdsourced radiation site that aims to keep users up to date on exactly how high radiation levels are in Japan and on the West Coast of the U.S.