Well, its widely known that they have enhanced musculature. This allows them to tighten their abdomen to such great tension that their flatulence leaves their bodies at such pressure that they are propelled along at whatever speed they want.
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With no trail of solids?
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Where do you think airborne particulate pollution comes from?
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Nonononononononoononononononononono.....
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I'm afraid so. You have been breathing in Kryptonian fecal matter.
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Aw. Fu.ck.