7. Generate power.
Why flush it when you can use it to power your cell phone? In Nigeria, four girls created a pee-powered generator that can generate six hours of electricity with one liter of urine. It separates out the hydrogen in urine, removes the moisture, and pushes the hydrogen gas into the generator. Similarly, scientists in Singapore created a battery that is activated by biofluids like urine and can be used to power devices that test for diseases.