Hedgehogs are the oldest mammals.

In ancient Greece, throwing an apple at someone was done to declare one's love.

The octopus has three hearts and blue blood.

In the USA, it is not customary to pay for a girl in a restaurant. It's considered male superiority over women.

The female brain gathers information 5 times faster than the male brain.

Caffeine's molecule is similar to that of cocaine, and heroin.

A giraffe needs only 2 hours of sleep a day, whereas a brown bat needs 20 hours a day.

Earth is the only planet in our solar system not named after ancient gods.

Clouds look so light and weightless, but the average cloud actually weighs around 500,000kg.

Smokers are four times more likely than non-smokers to complain of feeling tired in the morning and are 70% more likely to have hearing problems.

Only 15% of people can brush their teeth with both hands.

The hippopotamus can open its mouth incredibly wide, forming an angle of 150 degrees.

Human trafficking makes $150 billion a year.

You have a much better chance of finding a bar of gold than winning the lottery.

Stress can be caused by eating a lot of salt.

Eugene Shoemaker is the only man to be buried on the moon.

About 80 per cent of all infectious diseases are linked to poor quality drinking water.

The first car to go into production was the Ford Model T, launched in 1908.

To make cheese sauce for nachos, they use sodium citrate, whose formula, by an amazing coincidence, looks like this: Na₃C₆H₅O₇.

A "Beefalo" is a cross between domesticated cows and 37.5% American Bison.