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See the original image at popularmechanics.com —

New Science of Fear: Can It Predict Bravery at 13,500 Ft?

popularmechanics.com — In a few minutes we'll be riding in a Cessna 207 up to 13,500 ft. —then jumping out of it. It's a beautiful day, and I understand rationally that I have little to fear. Yet I am filled with an almost overwhelming sense of dread.

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