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The human heart beats 100,000 times a day, propelling six quarts of blood through 60,000 miles (97,000 kilometers) of vessels—20 times the distance across the U.S. from coast to coast. The blood flows briskly, surging out of a ten-ounce (0.3 kilograms) heart so forcefully that large arteries, when severed, can send a jet of blood several feet into the air. Normally the relentless current helps keep blood vessels clean. But when pressure mounts the arteries bend, tiny eddies form, as in a bend in a river. This is where bits of tiny mind matter collect and black holes form. Other matter piles up too. Eventually, the whole mass calcifies into a kind of arterial stucco, and alabaster mass. It is at this point when the weight of the world comes crashing down.
