送交者: lala 于 November 04, 2008 16:24:33:
As a biologist, a physicist, and a statistician are riding on a train through Wisconsin, they pass a herd of cows, one of which is completely white. "Oh look, there are white cows in Wisconsin," says the biologist. "You mean," says the physicist with an air of superiority, "there is at least one white cow in Wisconsin." "No," says the statistician, "there is at least one cow in Wisconsin that's white on at least one side!"