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The Brains of Early Birds and Night Owls

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Early birds wake up at the crack of dawn and struggle to stay alert and productive (especially in the cognitive realm) in the evening. Night owls perform well in the evening but are worthless if you yank them out of bed too early in the morning. There...

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  • This Dinosaur was a 'Cow'

    Sharon Begley | Nov 15, 2007 10:05 AM
    Nigersaurus: 500 teeth and a vegetarian diet. Photo by Mike Hettwer, courtesy of Project Exploration. ©2007 National Geographic.

    Every so often paleontologists discover a new species of dinosaur that isn't an '-est'—biggest, longest, oldest—but that stands out for being (once-) living proof of how creative evolution can get. A find being announced this morning in the online journal PLoS ONE, as well as in the December issue of National Geographic, is one of them: a 110 million-year-old dinosaur whose mouth hoovered up food, who had some 500 tiny teeth, including spares, and who sported a nearly translucent skull.

    Discovered in 1999 in the Sahara desert by National Geographic Explorer-in-Residence Paul Sereno of  the University of Chicago, Nigersaurus taqueti was a vegetarian originally known only by a few distinctive hand bones. But further excavation has fleshed (boned?) him out.

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