Four Nigerian girls invented a generator that produces six hours of electricity using just one litre of urine as fuel.

Original review summary

FACTLY reports that four Nigerian schoolgirls showcased a urine-powered generator in 2012, but says the evidence does not establish that it could provide six hours of electricity from one litre of urine. The review notes that a documentary showed it powering simple light bulbs or a wall light, while experts raised concerns about its efficiency and practicality.[S1]