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Destin of SmarterEveryDay is an aerospace engineer whose deteriorating vision barred him from becoming a fighter jet pilot. Thanks to the 560th T-38 Flying Training Squadron, however, he was finally able to soar above the clouds and pull a few Gs for real. What’s really handy here is Destin’s explanation of how your body–and the T-38 jet–react to high G-forces in flight. Some of the situations he demonstrates, like doing a loop, put your body and the aircraft under enough Gs to be potentially deadly.