When free hydrogen is in the atmosphere it tends to leak out into space, if I recall correctly.
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Replying to @chaosprime
@chaosprime It's not free hydrogen (i.e., it's bound to oxygen).1 reply 0 retweets 0 likes
@scalzi The oxygen isn't free either, it's in O₂, CO₂, H₂O and whatnot.
12:04 PM - 24 Apr 2013
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