http://www.popsci.com/bown/2012/product/mit-solarclave
Boiling water isn’t enough to sterilize medical instruments, which is part of the reason that a quarter of surgery patients in rural clinics in developing countries end up with infections. What’s really needed is an autoclave, which blasts tools with 250°F steam under pressure. MIT researchers figured out how to build an autoclave that requires only inexpensive, commonly available materials—a pressure cooker, small mirrors, and buckets—which together concentrate solar rays and produce microbe-killing conditions in 90 minutes.
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