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Veni, vedi, fish velocipede
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Collect biogas in diaper, void in holding tank for future use
Diaper collects biogas. Have collection stations in convenient locations (Conveniently at public toilets if you feel public spirited or just at home. Diaper will hook up to holding tank where gas is stored for use whenever required.
||Someone already got this one - Fart collection underpants. Sorry, should have checked. Not only half baked but also short fused.