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National Geographic
http://natgeotv.com/

Earth's magnetic field reverses about once every 200,000 years on average http://ow.ly/1dMlE Naked Science tonight

3/4/2010 3:30:15 PM from HootSuite

VIDEO: Earth is due for a traumatic magnetic reversals of the poles - but when? http://ow.ly/1dLZ8

3/4/2010 2:30:12 PM from HootSuite

Random fact: Leap years are every 4 years, except on century years that aren't also divisible by 400 (1900, 2100, etc)

3/4/2010 1:30:09 PM from HootSuite

Is the Earth losing its magnetic field...and will it be doomed to a fate similar to Mars? http://ow.ly/1dM7m

3/4/2010 1:00:23 PM from HootSuite

Can special operations officers perform under extreme circumstances? Watch at 9 to find out. http://ow.ly/1dLTF

3/4/2010 12:05:11 PM from HootSuite

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