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At this year's Winter Olympics in Pyeongchang, we may see quad corks in Big Air Snowboarding or in Freestyle Skiing -- and we'll see quad twists and quad jumps in Figure Skating. But have we reached the limit of what's possible? To do a quad, a skater's got less than a second to turn their body four times in the air. WIRED's Robbie Gonzalez set out to find out why five...is almost impossible.