• 1. Your mouth produces about one litre of saliva each day!
  • 2. Your brain is sometimes more active when you’re asleep than when you’re awake.
  • 3. Laid end to end, an adult’s blood vessels could circle Earth’s equator four times!
  • 4. The word “muscle” comes from Latin term meaning “little mouse“, which is what Ancient Romans thought flexed bicep muscles resembled.
  • 5. Bodies give off a tiny amount of light that’s too weak for the eye to see.
  • 6. The average person has 67 different species of bacteria in their belly button.
  • 7. You lose about 4kg of skin cells every year!
  • 8. Babies don’t shed tears until they’re at least one month old.
  • 9. Information zooms along nerves at about 400kmph!
  • 10. The human heart beats more than three billion times in an average lifespan.
  • 11. Your left lung is about 10 percent smaller than your right one.
  • 12. Human teeth are just as strong as shark teeth.
  • 13. Scientists estimate that the nose can recognise a trillion different scents!
  • 14. Humans are the only species known to blush.
  • 15. Your blood makes up about eight percent of your body weight.

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