A giant tortoise.

This joke is from the opening paragraph of Stephen Hawkings book,
A Brief History of Time.

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?

Youre very clever, young man, very clever, said the old lady.
But its turtles all the way down!

Most viewed Jokes (20)