Natural selection ( I wish I had thought of that name) I am a Biologist and understand more than most in terms of science an chemistry and what ever but the fact remains that I and whoever I take diving, boating, wake boarding or fishing are 1000 times safer than those sods I passed on the road to get to the ramp. We all live in our moment and accccccept the liability of our actions. My Daughter said to me the other day, "dad I saw a shark but I could not get a good photo" My son and I just had shot six or seven Coral Trout (Plectopomous maculatsus) or Island Trout, no problems Babe I said how big was it, she said, not so big. Then I was down six meters on the same coral fringe (Headland on an Island) and I saw the F+++ing thing and I was out of there. Bull shark 10 feet and clearly interested in the ongoing human activity. So why am I worried about me and my physiology and all that shit> I dive to be there not to be square.