South Korean professor Cho Jae-weon invented a toilet that turns poop into energy and pays people in digital currency. A person defecates~ 500g/day converted into 50 liters of methane gas which generates 0.5 kWh. Toilet users earn Ggool, a literal shit coin. Watch video to see how https://youtu.be/s6z5OduN8vo How to make your own https://youtu.be/JYda2v94dgc