For a moment picture yourself resting comfortably in a kneeling position at the base of the Washington Monument. Suddenly you have the urge to jump as high as you can. Summoning all your muscle power, you thrust your body upward and in no time at all you find yourself sailing over the top of this mighty obelisk with plenty of room to spare. Impossible, of course, unless you happen to be the bionic man or woman. But not if you are a human flea.
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