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contra64

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Comment #13372132
Eventually, the constituent atoms themselves perform a complete cycle (at the slowest rates) every ~7 years. Some substances (e.g. water) cycle much faster, obviously. http://www.n…

Wed, Jan 11, 2017, 6:18 AM UTC
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Comment #13371979
Wed, Jan 11, 2017, 5:28 AM UTC
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Comment #13371836
Wed, Jan 11, 2017, 4:50 AM UTC
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Comment #13371828
Wed, Jan 11, 2017, 4:47 AM UTC
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Comment #13371497
Wed, Jan 11, 2017, 3:26 AM UTC