Pioneer in Science: John Grunsfeld

After a storied career with 5 spaceflights (including three trips to fix the Hubble Space Telescope), NASA astronaut John Grunsfeld now helms the space agency's scientific missions. He helps shepherd billions of dollars' worth of technology through testing to make sure it can survive and function in the rigors of space. See Grunsfeld describe his journey from the South Side of Chicago to orbit, why spaceflight is so addictive, and what it takes to be a Hubble repairman.

Original Program date: May 30, 2014

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