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I imagine that every skydiver who __1___ an airplane or every bungee jumper who jumps off a bridge _2___ the same thing. Maybe we’re ___3___ these sports not because they’re exciting, but because they give us the ___4__ to face our biggest fear—that someday our lives will end. We’re the only __5__that knows this, and we’re the only one that seems to need to __6__ for it again and again.