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Of all the random garbage floating around in the air, around 15 percent was comprised of human skin particles, and the accompanying Staphylococcus bacteria. What kind of skin, you ask? A lot if it came from pretty normal, exposed places like hands, feet, arms, and collarbones. At least some of it, though, was believed to come from the "gluteal crease," which Wikipedia helpfully clarifies as "colloquially, the 'butt crack' or 'arse crack.'" Oof.