Electronics engineers at my school got taught principles such as "conservation of energy." Farmers produce food from shit, but there's a lot of other materials and energy inputs going into the process. Saying you can get energy from water is just as true as saying you can get food from shit . . . it just ignores all the really difficult and expensive parts of the job.

As for using my imagination, it doesn't take much to imagine someone with connections to a Senator scamming the government out of a few million bucks by deluding the ignorant.