If I heat a sample of water with a dangerous microbial contamination (whatever common, dangerous waterborne illness) until it boils the microbes die. My question is why do they die? Is it the microwaves that kill them via radiological effects or is it the heat that does it? (ie the microwaves interacting with the microbes vs the microwaves interacting with the water and the water interacting with the microbes) Could a microwave be built to kill bacteria with low intensity microwaves? Low intensity microwaves which could be generated by power from a hand crank or pedal style generator? If so could microwaves used to sanitize water in developing nations with simple gear like magnets and broken microwaves?