"Jump out of the plane on my count, at 5. Ready?" the sky diver instructor says to you, a nervous first-time customer, crouched in a tiny Cessna plane flying 10,000 feet above the air. You are pulsing with adrenaline. Wide eye fear.
"Ok," you say, unconvincingly. "Ready."
The instructor kicks open the door to the plane. Air rushes through the open door and the aircraft rattles a bit in the sky. Fear turns to panic, as every fiber of your body -- everything evolution has taught you -- says to not jump out of an open aircraft.
