" have striking memories of the first microbiology class I took. The instructor asked me and my classmates to place our hands on the agar gel in petri dishes that had been placed on our lab benches. A week later we returned to the lab to find our petri dishes contained gnarly black, yellow, white, and green furry monstrosities growing in the precise shape of our hands. That petri dish was easily the most vivid demonstration of the importance of hand washing I’ve ever seen. We "

― Jayson Lusk , Unnaturally Delicious: How Science and Technology are Serving Up Super Foods to Save the World