Dave Witlock is a practical man. "I have not taken a shower in over 12 years," says the chemical engineer and Massachusetts Institute of Technology graduate. "No one did clinical trials on people taking showers every day. So what's the basis for assuming that that is a healthy practice?"
Twice a day, Mr. Witlock applies a live bacteria solution of his own design to his skin. To spread the bacteria to everyone else, he has founded a company called AOBiome and is selling a spray that contains live ammonia oxidizing bacteria (AOB), called Mother Dirt.