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Mar 1, 2017 at 2:30 vote accept S. Kohn
Feb 28, 2017 at 16:17 answer added John Rennie timeline score: 6
Feb 28, 2017 at 15:41 comment added dmckee --- ex-moderator kitten For the most part primaries don't make it to elevations where humans live. Remember that there are around 10,000 kg of atmosphere above each square meter of surface. That's a lot of shielding.
Feb 28, 2017 at 13:01 history asked S. Kohn CC BY-SA 3.0