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The Mysterious Leap Second

Leap Day's got nothing on the Leap SECOND! Hank explains why a second is being added to 2012 and why some are upset about it. Like SciShow on Facebook: http://www.facebook.com/scishow Follow SciShow on Twitter: http://www.twitter.com/scishow leap second, leap day, 2012, hank green, scishow, sci show, mean solar time, atomic clock, itu, moon, tides
Length: 04:33

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