[ExI] Astronaut twin experiment

David Lubkin lubkin at unreasonable.com
Fri Apr 11 14:44:16 UTC 2014

NASA to Conduct Unprecedented Twin Experiment

This is an obvious (and good) idea. So why did it take them so long? 
Both were selected as astronaut candidates *18* years ago. And I'd 
think they'd get clearer data before Mark had had four spaceflights 
of his own.

-- David.

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