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Turtles All the Way Down

I used this phrase a lot during my working years, when someone started fussing at me about causation and religion.  I used it so much, a friend gave me a plaque with itit imprinted on it for my retirement.  I just saw it used again and dug up the quote where I got it from:

A well-known scientist (some say it was Bertrand Russell) once gave a public lecture on astronomy. He described how the earth orbits around the sun and how the sun, in turn, orbits around the center of a vast collection of stars called our galaxy. At the end of the lecture, a little old lady at the back of the room got up and said: "What you have told us is rubbish. The world is really a flat plate supported on the back of a giant tortoise." The scientist gave a superior smile before replying, "What is the tortoise standing on?" "You're very clever, young man, very clever," said the old lady. "But it's turtles all the way down!"[2]

This is from Stephen Hawking's A Brief History of Time.

When I read the first Disc World book I laughed myself silly.  Pratchett obviously liked the quote too.

EDIT!  LOL.. And of course Cafe Press has the tee shirt