12/12/12: Why Today Is Tied to Doom

the mayan long-count calendar
Some believe the end of the Mayan calendar, Dec. 21, 2012, will usher in a new spiritual era or even a doomsday. And new research suggests the civilization's demise long ago may have been partly their own doing.
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Updated at 8:42 p.m. ET

A seemingly benign number that defines everything from a dozen eggs and the hours of day and night to the days of Christmas and the astrological signs, 12 may be in the spotlight today, 12/12/12.

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Managing editor, Scientific American

Jeanna Bryner is managing editor of Scientific American. Previously she was editor in chief of Live Science and, prior to that, an editor at Scholastic's Science World magazine. Bryner has an English degree from Salisbury University, a master's degree in biogeochemistry and environmental sciences from the University of Maryland and a graduate science journalism degree from New York University. She has worked as a biologist in Florida, where she monitored wetlands and did field surveys for endangered species, including the gorgeous Florida Scrub Jay. She also received an ocean sciences journalism fellowship from the Woods Hole Oceanographic Institution. She is a firm believer that science is for everyone and that just about everything can be viewed through the lens of science.