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The half-life of a radioactive substance is the time required for half of a sample to undergo radioactive decay, or for the quantity to fall to half its original amount. Carbon 14 has a half-life of 5,
asked
Apr 18, 2017
Mathematics
high-school
2
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0
votes
16.8k
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After the Peloponnesian war which city-state gained control of all of greece for a short period of time?
asked
Nov 13, 2016
History
high-school
1
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4
votes
129k
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