Human Body Facts for Kids

Goosebumps are left over from our ancestors — their raised body hair made them look bigger to scare off predators.

Tooth enamel is the hardest substance in your entire body — even harder than bone.

Your eyes are almost the same size from birth, which is why babies' eyes look so big.

Your feet have about 250,000 sweat glands and can produce over a cup of sweat each day.

Your hair grows about 6 inches per year — that's roughly half an inch per month.

Your body has over 600 muscles that work together to help you move.

Your body produces about 25 million new cells every single second.

All humans share 99.9% of the same DNA — only 0.1% makes you unique.

Your lungs contain about 300 million tiny air sacs called alveoli that help you breathe.

Scientists now believe the appendix is not useless — it may serve as a safe house for helpful gut bacteria.