If you've ever been to a state or national park, you've probably used a vault toilet. It's a waterless toilet system for ...

Composting toilets use aerobic decomposition to break down human waste instead of flushing it away in watery sewage. Most don't use water, so they don't need to be connected to a city wastewater ...

Add Yahoo as a preferred source to see more of our stories on Google. When you gotta go, you gotta go–even at 30,000 feet. The alarming noise ensues when you press the “flush” button in an airplane ...

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