Human Body Facts for Kids
Surprising facts about your body
The lining of your stomach is replaced every three to five days to protect it from being digested by its own acid.
A sneeze can travel at speeds of up to 100 miles per hour (160 km/h) and send thousands of tiny droplets into the air.
Your lungs contain about 300 million tiny air sacs called alveoli, which give them a total surface area roughly the size of a tennis court.
Fingernails grow about four times faster than toenails, growing roughly 3.5 mm per month on average.
The human eye can distinguish up to ten million different colours, thanks to three types of colour-detecting cells called cones.
The liver is the busiest organ in your body, performing over 500 different functions including filtering toxins from your blood.
Your tongue is covered in around 10,000 taste buds, and these are replaced roughly every two weeks throughout your life.
Your ears never stop working, even when you are asleep — the brain simply filters out sounds so you can rest.
Despite being called 'small', your small intestine is about six metres long — much longer than the large intestine.
Bone is stronger than steel for its weight — a block of bone the size of a matchbox can support up to nine tonnes of weight.