here's an article about an adrenaline junkie

read it and notice whats missing

http://sportsillustrated.cnn.com/2008/more/01/22/extreme.skier.dies.ap/index.html?cnn=yes

What, besides a picture?:yak6:
I'd say "a helmet or a parachute, but it's only a guess.

A heartbeat? Common sense? Awareness of one's own limitations?

a life insurance policy?

An understanding of physics and gravity?

How about a sound byte of the guy saying "Now watch what I do next!"