Last week at Maker Faire Africa, four Nigerian teenage girls presented a generator powered by—wait for it—pee. Duro-Aina Adebola, Akindele Abiola, and Faleke Oluwatoyin, all 14, and Bello Eniola, 15, invented the machine, which separates hydrogen from urine with an electrolytic cell, purifies the hydrogen, and pressurizes the resulting gas through a generator to power a lightbulb. According to the girls, one liter of urine can ... Read More