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November 27, 2014

November 27, 2014

Posted by **Andrea** on Monday, November 18, 2013 at 8:45am.

- Half-life -
**bobpursley**, Monday, November 18, 2013 at 10:18amone half =1/2 left

two half=1/4

three half=1/8

four half=1/15

one halflive=1/4 * 2hours=30 min

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