- Wearing headphones for just an hour could increase the bacteria in your ear by 700 times.

- An ostrich's eye is bigger than its brain.

- "Dreamt" is the only English word that ends in the letters "mt".

- Only female mosquitoes bite.

- Spiders are arachnids and not insects.

- The average human brain contains arounds 75 per cent water.

- Earth inner core is almost as big as the moon.

- Tomato ketchup was used as a medicine, back in the 1830s.