The definitive list of the world's most unexpected facts

1.

If you eat a polar bear liver you could die. They have too much Vitamin A, which is toxic to humans in large amounts.

Via the University of Cambridge

2.

Before mating a male giraffe will smell a female giraffe’s urine to check she is ovulating in a process known as the Flehmen response.

Via the World Animal Foundation.

3.

One strand of human hair can hold 100g in weight.

Via the Guardian

4.

Honey does not go off. Your great-great-great-great grandchild could eat a jar of honey you bought five years ago without any problems.

Via i09

5.

• (Picture: Getty)

You have a unique tongue print.

Via springer

6.

Some infinities are bigger than others.

Via i09

7.

Romans used to clean their teeth with urine.

Via smithsonianmag

8.

Double agent Joan Pujol Garcia won an Iron Cross from the Germans and an MBA from the Brits for his work in World War II.

Via MI5

9.

Saudi Arabia imports camels... from Australia.

Via the BBC

10.

• (Picture: Getty)

High heels were originally for Persian soldiers to make it easier for them to stand in stirrups while horse riding.

Via Kodoom

11.

Botox is the most lethal toxin known to man.

Via the BBC

12.

There is only one country between North Korea and Finland… Russia.

Via imgur.

13.

• (Picture: Alamy)

Lobsters don’t age.

Via the Daily Mail

14.

The youngest confirmed mother in history was five years old.

Via Yahoo

15.

Marie Curie’s notebooks are still radioactive

Via Women's History

16.

The Turritopsis dohrnii, a type of jellyfish, is immortal

Via the Telegraph

17.

In 1975 Professor Jack H Hetherington added his siamese cat as a co-author on a physics paper

Via UCLA.

18.

• (Picture: Getty)

Oceanographer Robert Ballard was on a secret Cold War navy mission to check on sunken nuclear submarines when he found the remains of the Titanic.

Via Bloomberg

19.

The colour orange used to be called ‘red yellow’

Via Huffington Post

20.

Norway once knighted a penguin

Via the BBC

21.

Tina Turner’s songs are used to scare birds off the runway at Staverton airport

Via the Independent

22.

• (Picture: AP)

Christopher Walken used to work as a lion tamer

Via Vanity Fair

23.

You can be allergic to semen

Via Columbia university

24.

Andy Garcia was born with an undeveloped conjoined twin around the size of a tennis ball attached to his shoulder

Via the Telegraph

More: Here are 24 phenomena which prove nature is actually marvellous