If a man is

Da Vinci's sketch of a parachute

If a man is provided with a length of gummed linen cloth with a length of 12 yards on each side and 12 yards high, he can jump from any great height whatsoever without injury.
Despite warnings that the canvas and wood parachute would collapse, Adrian Nicholas jumped from 10,000 feet yesterday to prove that Da Vinci’s design was sound.

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