John Grunsfeld Announces Retirement from NASA via NASA https://t.co/wAq4DRDy7u

John Grunsfeld Announces Retirement from NASA via NASA https://t.co/wAq4DRDy7u

— John Prieto (@prietoj) April 5, 2016

from Twitter https://twitter.com/prietoj

April 05, 2016 at 02:09PM
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