1) Your mouth makes about one liter of saliva every day! Over a lifetime that adds up to around 25,000 liters – enough to fill a swimming pool. 🤤
2) Surprise! Your brain is actually busier while you sleep than when you’re awake. It uses those hours to clear out waste and refresh your brain cells and the connections between them.
3) If you laid all of an adult’s blood vessels end to end, they could wrap around the Earth’s equator four times!
4) Here’s something to blush about: humans are the only species that blushes. Animals don’t have this ability – maybe because they never get embarrassed.
5) We shed about 4 kg of skin cells every year! Your body replaces its outer layer of skin roughly every 27 days, so over a lifetime you’ll get a “new skin” about a thousand times.
6) About 100,000 hairs grow on our heads (unless you’re bald, of course). Over an average lifetime, a person grows around 950 kilometers of hair! Blondes usually have more hairs on their heads than people with dark hair.
7) Blood makes up about eight percent of your body weight. For an adult, that’s about 5 liters!
8) The human heart beats more than two and a half billion times in an average lifetime. Even though it weighs only about 350 grams, it pumps blood amazingly well, beating about 100,000 times every single day – and it pumps so much blood that it could fill a small swimming pool in a few days. Incredible!
9) About 40 trillion bacteria live in and on the average person’s body. They get water, food and a cozy place to live, and in return they help protect us from germs that cause illness, help us digest food and even make vitamins. Only a tiny fraction of bacteria actually make us sick.
10) Your body contains enough iron to make a nail about 8 cm long, enough carbon to make around 900 pencils, and enough phosphorus for about 2,200 match heads. Plus, there’s enough water in you to fill a 45-liter tank!
