The culture medium, environment, the chemistry. Yes, not the genes. We said the genes control us. I say, No, wait. They were all exact same genes so the difference between muscle, bone and fat cells was not determined by the genes, they all had the same genes. It was determined by the environment. Now look in the mirror and what do you see back? An individual entity. You see yourself as single individual, human entity. It’s a misperception of a singleness for this reason. Here’s the true bottom line. You are made up to fifty trillion cells. Your body is a community. The cells are the living entity. When I say your name or I say Bruce, that’s a name I give to a community of fifty trillion cells. The cells again are those single living entity. Here’s the point. Jokey but fun and true. You are skin covered petri dish. Underneath your skin are fifty trillion cells growing in this petri dish.