A fetus acquires fingerprints at the age of three months.
A fingernail or toenail takes about 6 months to grow from base to tip.
A human being loses an average of 40 to 100 strands of hair a day.
A person will die from total lack of sleep sooner than from starvation. Death will occur about 10 days without sleep, while starvation takes a few weeks.
According to the Kinsey Institute, the biggest erect penis on record measures
An average human scalp has 100,000 hairs.
Babies are born with 300 bones, but by adulthood we have only
Blondes have more hair than dark-haired people.
Each square inch of human skin consists of twenty feet of blood vessels.
Every human spent about half an hour as a single cell.
Every person has a unique tongue print.
Every square inch of the human body has an average of 32 million bacteria on it.
Humans have 46 chromosomes, peas have 14 and crayfish have 200.
Humans shed about 600,000 particles of skin every hour - about
Humans shed and re-grow outer skin cells about every 27 days - almost 1,000 new skins in a lifetime.
If you are locked in a completely sealed room, you will die of carbon dioxide poisoning first before you will die of oxygen deprivation.
If you go blind in one eye, you'll only lose about one-fifth of your vision (but all your depth perception.)
In the late 19th century, millions of human mummies were used as fuel for locomotives in
It takes 17 muscles to smile – 43 to frown.
It would take 1,200,000 mosquitoes, each sucking once, to completely drain the average human of blood.
Laughing lowers levels of stress hormones and strengthens the immune system. Six-year-olds laugh an average of 300 times a day. Adults only laugh 15 to 100 times a day.
Some people never develop fingerprints at all. Two rare genetic defects, known as Naegeli syndrome and dermatopathia pigmentosa reticularis, can leave carriers without any identifying ridges on their skin.
The average duration of sexual intercourse for humans is 2 minutes.
The average human body contains enough: iron to make a
The average human produces
The body's largest internal organ is the small intestine at an average length of
The feet account for one quarter of all the human bodies bones.
The human body has over 600 muscles, 40% of the body's weight.
The human brain is about 85% water.
The largest cell in the human body is the female ovum, or egg cell. It is about 1/180 inch in diameter. The smallest cell in the human body is the male sperm. It takes about 175,000 sperm cells to weigh as much as a single egg cell.
The largest cell in the human body is the female reproductive cell, the ovum. The smallest is the male sperm.
The largest human organ is the skin, with a surface area of about
The left lung is smaller than the right lung to make room for the heart.
The longest muscle in the human body is the sartorius. This narrow muscle of the thigh passes obliquely across the front of the thigh and helps rotate the leg to the position assumed in sitting cross-legged. Its name is a derivation of the adjective "sartorial," a reference to what was the traditional cross-legged position of tailors (or "sartors") at work.
The most common blood type in the world is Type O. The rarest, Type A-H, has been found in less than a dozen people since the type was discovered.
The Neanderthal's brain was bigger than yours is.
The only bone in the human body not connected to another is the hyoid, a V-shaped bone located at the base of the tongue between the mandible and the voice box. Its function is to support the tongue and its muscles.
The only time the human population declined was in the years following 1347, the start of the epidemic of the plague 'Black Death' in
Though it makes up only 2 percent of our total body weight, the brain demands 20 percent of the body's oxygen and calories.
Three-hundred-million cells die in the human body every minute.
Women's hearts beat faster than men's.
Your stomach cells secrete hydrochloric acid, a corrosive compound used to treat metals in the industrial world. It can pickle steel, but mucous lining the stomach wall keeps this poisonous liquid safely in the digestive system.