My Bookmarks on Science & Technology, Climate Change, Astrobiology, Genetics, Evolution

“Reversals are the rule, not the exception. Earth has settled in the last 20 million years into a pattern of a pole reversal about every 200,000 to 300,000 years, although it has been more than twice that long since the last reversal. A reversal happens over hundreds or thousands of years, and it is not exactly a clean back flip.”

http://www.eurekalert.org/pub_releases/2011-11/nsfc-mpr113011.php

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