In order for humans to taste something, saliva needs to dissolve it.
The human eye is so sensitive that if the Earth were flat, you could spot a candle flickering at night from up to 30 miles away.
The average person produces enough saliva in their lifetime to fill one large swimming pool.
When you blush, the lining of your stomach blushes too.
The muscles which control your eyes contract about 100,000 times a day. That's the equivalent of giving your legs a workout by walking 50 miles.
With the 60,000 miles of blood vessels inside the average human body, you could circumnavigate Earth two and a half times.
Over the course of an average lifetime, people shed about 40lbs of skin.
In each human kidney, there are 1 million filters that clean around 1.3 liters of blood every minute and push out close to 1.5 liters of urine every day.
Nerve impulses travel to and from the brain at speeds of up to 250 miles per hour.
Human female ovaries contain over 500,000 eggs but only about 400 get the opportunity to create life.
When in love, the human brain releases the same cocktail of neurotransmitters and hormones that are released by amphetamines. That leads to increased heart rate, loss of appetite and sleep, and intense feelings of excitement.
Except for twins, every human being has a completely unique smell.
An adult is made up of 7,000,000,000,000,000,000,000,000,000 (7 octillion) atoms. For perspective, there’s a "measly" 300,000,000,000 (300 billion) stars in our galaxy.
A circumcised male adult's or baby's foreskin is often used as a skin graft for burn victims.
Humans have the same amount of hairs on our body as a chimpanzee. But, most of them are useless and so fine that they are invisible.
Along with the five traditional senses of sound, sight, touch, smell and taste, humans have 15 other senses. These include balance, temperature, pain and time as well as internal senses for suffocation, thirst, and fullness.
Human skin is the largest organ in the body. If an adult male's skin were stretched out, it would cover 20 square feet.
In just 30 minutes, the human body can produce enough heat to boil half a gallon of water.
The atoms that make up your human body today are same atoms that formed during the Big Bang 13.7 billion years ago. (Sorry, Christian Fundamentalists, but evolution and not creationism is a fact.)
Every 60 seconds, your red blood cells do a complete circuit of a human body.
For every pound of fat or muscle gained, the human body creates seven miles of new blood vessels.
Most babies are born with blue eyes but exposure to ultraviolet light brings out their true color.
Humans share 50% of their DNA with bananas.
It can take your finger and toenails up to a half-year to grow an entirely new nail from the base to the tip.
Loneliness is physically painful. Just as humans have a drive to avoid physical pain, they have a similarly powerful drive to connect with others and seek companionship in order to avoid the pain of loneliness.
The stomach does not digest itself because stomach cells are created faster than they can be destroyed.
The human body produces 25 million new cells each second. Every 13 seconds, you produce more cells than there are people in the United States.
Humans are extremely visual. 90% of the information humans gather from their surroundings is gathered from the eyes.
The average man produces about 10 million new sperm daily, approximately enough to repopulate the entire planet in 6 months.
Humans are bioluminescent and glow in the dark. The light that we emit is 1,000 times weaker than our human eyes are able to pick up.
There are more than 300,000,000 capillaries in a human lung and if they were stretched out tip to tip they would reach approximately 1,300 miles.
Around 90% of the cells that make humans are not human in origin. People are mostly fungi and bacteria.
Humans shed 40 pounds of skin in their lifetime, completely replacing their outer skin every month.
Frequent night dreams have been correlated with having a higher than average IQ.
Cartilage in the human spine slowly compresses throughout the day. As a result, an average person is about 1cm shorter when they go to bed at night as compared to when they wake up in the morning.
Crying alleviates stress and allows humans to decrease feelings of anger and sadness. It also helps physically to let it out. Humans also produce differently structured tears depending on the reason for crying.