how do they know that the average person eats seven spiders a year?

Answer 1

they don't. Its another "internet fact", an almost-oxymoronic term that encompasses such statements as that goldfish have a memory span of three seconds (or 7 or 1.5 or whatever), or that a duck's quack is the only sound that doesn't echo, or that bats always turn left when leaving a cave. All false. It takes only a second's thought to realise that there is no possible way to arrive at a statistic on how many spiders 'an average person' would eat (the statement usually suggests that the spiders are swallowed in their sleep)

Answer 2

0. the total "swallowing spiders at the same time as you sleep" ingredient became a superior-natured prank. In 1993, Lisa Holst, a columnist for computing device specialist, became amused on the shape of human beings that believed each thing they received through e mail, so she invented a itemizing of ridiculous "info" and commenced circulating them. easily one of them became the drowsing spider swallow reality. yet another became that properly-known Y!a fave, the myth that a duck's quack is the purely sound that isn't echo.

Answer 3

They don't. That statistic was simply made up on the spot.