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An Astronaut's Guide to Life on Earth Flashcards unakite ~6–7 on the MohsColonel Chris Hadfield has spent decades training as an astronaut and has logged nearly 4000 hours in space. During this time he has broken into a Space Station with a Swiss army knife, disposed of a live snake while piloting a plane, and been temporarily blinded while clinging to the exterior of an orbiting spacecraft. The secret to Col. Hadfield's success and survival is an unconventional philosophy he learned at NASA: prepare for the worst and