A day on the planet Mercury is twice as long as its year. See more

Icthyomaniacs are people who are crazy about fish. See more

To "testify" was based on men in the Roman court swearing to a statement made by swearing on their testicles. See more

A chicken who just lost its head can run the length of a football field before dropping dead. See more

Albert Einstein's parents were worried he was mentally slow, because it took him a long time to learn how to speak. See more

The most common name in the world is Mohammed. See more

All the chemicals in the human body have a combined value of approximately £4.00. See more

Former enemies, America and Russia now have a great deal in common - they both lead the world in locking people up. See more

Banging your head against a wall uses 150 calories an hour. See more