His two most prominent example are DHMO and Ceasers' Urine, both commonly known as "water". Yes, we are very good at "filtering" water, and have even managed t

His two most prominent example are DHMO and Ceasers' Urine, both commonly known as "water". Yes, we are very good at "filtering" water, and have even managed to evolve to use this potentially harmful chemical as a biological cooling mechanism (sweat). Who knows what we'd be able to do with lead in our systems? I'm betting on protection against pesky UV radiation, or maybe kryptonite.