The lining of a person's stomach is replaced every 36 hours.

On the ground, a group of geese is a gaggle, in the sky it is a skein.

In Gulliver's Travels Jonathan Swift described the two moons of Mars, Phobos and Deimos, giving their exact size and speeds of rotation. He did this more than 100 years before either moon was discovered.

A M A Z I N G   F A C T S