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Have you ever wondered when seeing the doors of public toilets are always designed with a certain space above (adjacent to the ceiling) and below (adjacent to the brick floor)?

China has built many prominent public toilets, with a place that looks like a camera, some places like a castle.

British astronaut Tim Peake answers one of the most common questions about space exploration, how to go to the toilet.

South Korean scientists turn the toilet into a sustainable energy producer that is capable of converting human waste into bioenergy.