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 ...

GA-MASHASHANE, South Africa — At a high school in rural northern South Africa, more than 300 students and their teachers share three toilets, and that woefully lopsided figure isn’t the worst problem.

Teachers and pupils from a Mpumalanga school run the risk of contracting diseases if they continue using the overflowing pit latrines and waterless toilets they are forced to use. About 1 000 pupils ...