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John Rennie earned this badge 31 times

mar 23 at 11:49
Speed of the Moon
jan 21 at 18:00
How can two seas not mix?
jun 21 '12 at 9:46
Why wet is dark?
jun 3 '12 at 14:07
The temperature in space
may 15 '12 at 17:53
Why is a black hole black?

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