Your fingernails don’t actually grow after you’re dead.

Humans are the only animals with chins.

As you breathe, most of the air is going in and out of one nostril.

Blood makes up about ___ percent of your total body weight.

The human nose can detect about ____ different smells.

Belly buttons grow special hairs to catch lint.

Skin is the body’s largest organ and can comprise ___ percent of a person’s total weight.

There are certain kinds of tumors that can grow their own teeth and hair – they’re called teratomas.

Your tongue is made up of ____ interwoven muscle(s), similar in structure to an elephant’s trunk or an octopus’ tentacle

On a genetic level, all human beings are 92 percent identical.

Which muscles are the fastest of the human body?

Hair grows fast—about ___ inches per year. The only thing in the body that grows faster is bone marrow.

The heart beats more than ___ times in the average human lifespan.

Which part of the body is the only one with no blood supply?

The human body contains enough fat to make ___ bars of soap.

Between birth and death, the human body goes from having 300 bones, to ___.

When you blush, the inside of what part does too?

Astronauts can grow up to ___ inch(es) taller in space.

Your brain can survive for ___ minutes without oxygen.

In cases of extreme starvation, the brain will begin to eat itself.

When listening to music, your heartbeat will sync with the rhythm.

The small intestine is roughly 32 feet long.

One fifth (1/5) of your bones are in your feet.

Your left kidney is higher up than your right kidney.

Your ears and your nose never stop growing.

Women’s brains shrink during pregnancy.

Stomach acid can't dissolve metal

The average person produces enough saliva in their lifetime to fill ___.

Humans shed about ___ particles of skin every hour.

Babies blink ___ times a minute, while adults average ___ times a minute.

Which human muscle is the strongest?

While awake, your brain produces enough electricity to light ___ lightbulb(s) of 10W.

In camera terms, the human eye is about ___ megapixels.

You carry, on average, about ___ pounds of bacteria in your body.

Ounce for ounce, the femur is stronger than steel.

Messages from the human brain travel along nerves at the speed of sound.

There are more people in the world than there are bacteria in a human mouth.

Within three days of dying, the enzymes that digested a person’s food will begin to digest that person’s body.

A human skeleton renews itself completely every 5 years.

By the time a person reaches 70 years old, he or she will have consumed over ___ liters of water.

A person’s feet has about 500,000 sweat glands and can produce about _____ of sweat a day.

An average person walks about ___ in his or her lifetime.

The liver can regenerate itself.

Humans spend about ___ of their lives eating.

A person will eat approximately ___ of food in a lifetime

The average scalp contains about individual ___ hair.

The average person farts about ___ times a day.

The average person breathes about ___ times a day

If allowed to grow for their whole lifetime, the length of someone’s hair put end to end would be about ___ kilometres.