An adult body has 206 bones and 33 of them are in the spine.
You use 17 muscles when you smile.
There are 86 billion neurons in the brain.
Your heart beats between 60 and 100 times per minute.
We breathe almost 11,000 litres of air into our lungs every day.
It takes 7 seconds for food to travel from your mouth to your stomach.
And your two kidneys clean all the blood in your body every 30 minutes. Amazing!