The Brain

• 274 km per hour – that is how fast nerve impulses travel to and from the brain.
• The brain operates on the same amount of power as a 10-watt light bulb.
• The Encyclopedia Britannica holds five times less information than what our brains can hold.
• 20% of the oxygen that enters your blood is used in the brain.
• Your brain prefers night time. It is less active during the day.
• High IQ = more dreams.
• As you grow, your neurons grow with you.
• Water makes up 80% of the brain.
• Your brain cannot feel pain.
• Information travels at different speeds within different types of neurons.

The Senses

• Identical twins have the same smell, all other people smell differently.
• About one third of the human race has 20-20 vision.
• Your hearing is less sharp after you have eaten too much.
• 50 000 – the amount of scents your nose can identify and remember.
• You cannot taste anything that your saliva is unable to dissolve.
• The smallest noise can cause your pupils to dilate.
• Women are better smellers than men.

Muscles and bones

• It takes 17 muscles to smile and 43 to frown.
• Babies are born with 300 bones, but by adulthood only have 206.
• We are about One cm taller in the morning than in the evening.
• The strongest muscle in the human body is the tongue.
• The hardest bone in the human body is the jawbone.
• You use 200 muscles to take one step.
• The tooth is the only part of the human body that can’t repair itself.
• It takes twice as long to lose new muscle if you stop working out than it did to gain it.
• Bone is stronger than some steel.
• The feet account for one quarter of all the human body’s bones.

Internal Organs

• The small intestine is the largest organ.
• Throughout your life your adrenal glands change size.
• Nine meters – how far the heart can squirt blood.
• You could survive even if you removed a large part of your organs.
• The acid in your stomach is strong enough to dissolve razorblades.
• To make room for your heart, your left lung is smaller than your right.
• The human body is estimated to have 96 560 km of blood vessels.
• Your aorta’s diameter could be compared to that of a hose pipe.
• The liver serves over 500 functions.
• Every three to four days your stomach lining renews itself.
• The surface area of a human lung is equal to a tennis court.
• Women’s hearts beat faster than men’s.

Hair and Nails

• You have the same amount of hairs per square inch on your body as a chimp.
• Facial hair grows faster than the rest of the hair on your body.
• Human hair is virtually indestructible apart from when it is exposed to a flame.
• 60-100 – the amount of strands of hair you could lose per day.
• You must lose over 50% of your scalp hairs before it is apparent to anyone.
• Blondes have more fun, and more hair.
• A single hair of a male is twice as thick as that of a female.
• Your middle finger’s nail grows faster than all the others.
• Human hair can support 99 grams of weight.
• Fingernails grow four times faster than toenails.
• Three to Seven years – the lifespan of an average human hair.

Sex and Reproduction

• On any given day, sex takes place 120 million times on earth.
• Most men have erections every hour to hour and a half during sleep.
• The female egg is the largest cell, and the male sperm the smallest.
• At Three months a foetus already has fingerprints.
• You were a single cell for about half an hour.
• Six months before you are born your teeth already start growing.
• One out of every 2 000 newborns is born with a tooth.
• Frogs, worms and potted plants – the things pregnant women dream of most.

Bodily Functions

• 160 km per hour – the speed of a sneeze.
• A cough travels at about 97 km per hour.
• Earwax production is necessary for good ear health.
• Two swimming pools of saliva – you produce this throughout your life.
• When full, your bladder is roughly about the size of a grapefruit.
• 14 times a day – the average amount of flatulence (farts) one person expels per day.
• Feet have 500 000 sweat glands and can produce more than half a litre of sweat a day.
• Women blink twice as much as men do.
• 75% of human waste is made up of water.

Aging and Death

• A human head remains conscious for about 15 to 20 seconds after it has been decapitated.
• You would have lost half of your taste buds by the time you are 60 years-old.
• The ashes of a cremated person weigh about 4.1 kilograms.
• At birth, a baby’s head is a quarter of its length, when it is 25 years-old his/her head will be one eighth of their length.
• Your ears and nose never stop growing.
• By 60 years of age, 60% of men and 40% of women will snore.

Microscopic Level

• Every inch of your body is host to 32 million bacteria.
• 7.62 cm – the length of a nail the amount of iron in your body will be able to make.
• Just like a finger print, every tongue print is unique.
• Humans shed and re-grow outer skin cells about every 27 days.
• Three hundred million cells die in the human body every minute.
• Type O is the most common blood type.
• 60 000 – the amount of skin particles humans shed each hour.

Totally Random

• When scared your ears expel more earwax.
• It is impossible to tickle yourself.
• When you sleep in a cold room you are more likely to have a bad dream.
• Only humans can produce emotional tears.
• Right-handed people live longer than left-handed people.
• The length of your arm span is equal to your height.

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