​​​​​​​​​​​Quick Notes:​​​  

Have a great summer!  Be active, have fun, and do something different you've never done!


Frederick Kaiser - Lundahl Middle School

Human Facts

The following is a collection of information over the years about our amazing bodies and how they work.  If you have something interesting and new to add, send it to me!

- FUN FACTS -
(Useless But Interesting Bits of Human Trivia) 


Brain
1.The brain itself does not feel pain.
2.The left-hand side of the brain controls the right-hand side of the body, and vice versa.
3.The human body weighs 40 times more than the brain.
4.In your mid 30’s your brain becomes full in it’s ability to retain information, any new information replaces old information.
5.Each day we lose anywhere from 10,000 to 100,000 brain cells.
6.The human brain is about 75% water.
7.The brain uses the same amount of power as a 10-watt light bulb. 

Blood & Circulatory System
1.There are 60,000 miles of blood vessels in the human body, enough to go around the world about 3 times.
2.The human heart beats 100,000 times a day.
3.Your body is creating and killing 15 million red blood cells per second. 

Muscle & Strength
​1.If you stand with your elbow out at shoulder level and bring the tips of your four fingers together so they are just touching, the strongest person will not be able to pull them apart by pulling (not jerking) at your wrists.
2.A newborn baby’s grip is strong enough that they can hold themselves up hanging from a bar.
3.The human neck contains muscles, which are now redundant, that in early years of man’s evolution were used to wiggle the ears.
4.You only need about a third of the muscles to smile as you need to frown.
5.Your smallest muscle is in your ear.  It’s only about 4/100 of an inch long.
6.The heart is the strongest muscle in the human body. 

Skin
1.The human skin is sensitive enough to detect the weight of a fly’s wing.
2.The average person is covered with 18.5 square meters (22sq. ft.) of skin.
3.The skin is the thinnest on the eyelids and thickest in the lower back.
4.People shed a complete layer of skin a month.
5.The palms of your hands and the soles of your feet contain no pigment, so they do not tan in the sun.
6.Most dust particles in your house are made from dead skin.
7.The toughest skin on the body is on the soles of your feet.
8.During your life you will shed about 40 lbs. of skin.
9.If you ate too many carrots you would turn orange.
10.There are about 2 million sweat glands on the surface of the human body.
11.About 2% of sweat is made up of urea (urine).
12.The skin is the largest organ the body has.
13.Humans shed and re-grow outer skin cells about every 27 days. 

Eyes & Nervous System
1.The human eye is sensitive enough to detect the light from a candle from 30 miles away.
2.If you combine the total time your eyes are closed when you blink during the day, it would add up to about 2 minutes.
3.From birth until adult the eyes do not grow.
4.Women blink nearly twice as much as men.
5.A healthy (non-colorblind) human eye can distinguish between 500 shades of gray. 

Skeletal
1.The human skeleton is made up of about 206 bones, ½ of which are in the hands and feet.
2.After a bone breaks that part of the bone becomes stronger than it was originally.
3.The hardest bone in the human body is the jawbone.
4.When you were born you had over 800 bones.  As you grew, some of the bones on your skull and elsewhere joined together.
5.The bones of boxers and martial artists become more dense from training, to handle the impact and force subjected to them. 

Measurement (time, distance, weight, etc.)
1.The inside of your elbow to your wrist is the same size as your foot.
2.Each person loses approximately half a liter (one pint) of water in perspiration each day, and more if being energetic and/or in hot weather.
3.On average a person loses 11oz. of weight overnight.
4.Children grow faster in springtime than they do the rest of the year.
5.It takes 12 hours of steady walking to lose 1 lb. of weight.
6.People are taller first thing in the morning than they are at night.
7.Your arm span from fingertip to fingertip is the same as you are tall.
8.People usually have legs of slightly different lengths.
9.In a lifetime the average person eats more than 50 tons of food and drinks more than 13,000 gallons of liquid. 10.Every human spent about half an hour as a single cell.

Hair, Teeth, & Nails
1.One human hair can support a weight of up to 6.6lbs.
2.Silver fillings in teeth have been known to pick up radio waves.
3.Blond people have more hair on their head than on dark people.
4.Just before someone is struck by lightning their hair stands on end.
5.The human body has just as much hair as the apes, it’s just thinner.
6.It takes 2 months to grow an eyelash.
7.A hair is 70% easier to cut when soaked in warm water for two minutes.
8.Women’s hair is about half the diameter of men’s hair.
9.During an average lifetime, a man will spend 3,350 hour removing 8.4 meters of stubble.
10.Intelligent people have more zinc and copper in their hair.
11.There are approx. 550 hairs in the eyebrow.
12.The middle finger nail on each hand grows the fastest, the thumb nail the slowest.
13.Mosquitoes prefer biting fair-haired people.
14.Nails grow less than 1/10 of an inch per month.
15.Of you lose a nail; it would take about 6 months to grow it back.
16.Your hair grows faster in warmer weather.
17.The average hair on a person’s head grows 3 years before it falls out.
18.There are about 100,000 hairs on the human head.
19.A beard grows an average of 140 mm a year.
20.Our nails grow at a rate of around 0.1 mm per day.  So it would take roughly 3 months to replace an entire fingernail.
21.Finger nails grow about four time faster than toe nails.
22.Beards are the fastest growing hairs on the human body. If the average man never trimmed his beard, it would grow to nearly 30 feet long in his lifetime. 

Mouth, Tongue & Taste
1.The enamel on your teeth is the hardest substance in the human body.
2.Your tongue has 9 thousand taste buds.
3.Your tongue can detect 8 thousand different tastes.
4.If you’re about to sneeze, tickle the roof of your mouth with your tongue to stop it.
5.An average person will spend two weeks of their life kissing.
6.The life span of a taste bud is 10 days.
7.The average human produces 10,000 gallons of saliva in a lifetime.
8.A person swallows approx. 295 times while eating dinner. 

Sleep
1.Human beings are the only animals that will regularly sleep on their back.
2.You burn more calories sleeping than you do watching TV.
3.The colder the room you sleep in, the better the chances are that you’ll have a bad dream.
4.When you wake up in the morning and find crusty stuff in your eyes, which is essentially the same as the stuff in your nose.
5.The human body is better suited to two four-hour sleep cycles than one eight-hour one. 

Respiratory System
1.The surface area of human lung tissue is about the size of a tennis court.
2.At rest the average person breathes seven liters of air a minute.
3.You breathe about 10 million times a year.
4.The velocity of your cough can be up to 60 mph.
5.Human adults breathe about 23,000 times a day.
6.An adult male running fast breathes in over 5 gallons of air a minute.
7.The average person can distinguish about 4,000 different smells. 

Cool Miscellaneous
1.In 1935 the athlete Jesse Owens broke 4 world records in 45 minutes.
2.Bjorn Borg (7 time Wimbledon tennis champion) and Lance Armstrong (6 time Tour de France racer) were in such good shape; their heartbeat is only 31 times per min.
3.The human body is made up of over 100 million-million cells.
4.Humans average height is taller now than it was 2,000 years ago, and is still growing.
5.The human hand sets us apart from all other creatures because the thumb can touch each of the fingers independently.
6.Astronauts can grow an inch or so during their time in space.
7.There is enough potassium in the human body to fire a small cannon.
8.Gruesome studies have shown that a man weighing 150lbs. would provide enough meat to feed 75 people at one meal.
9.Knee caps are not developed on a new born baby and don’t grow until minimum of 6 months up to 6 years.
10.Whether you walk a mile or run a mile your body loses the same amount of weight, but running will get you in better condition.
11.Banging you head against a wall will use roughly 150 calories an hour.
12.It is estimated that around 10% of Americans have picked someone else’s nose.
13.One out of every three people can’t snap their fingers.
14.The force of 1 billion people jumping at the same time is equal to 500 tons of TNT.
15.The foot is the most common body part bitten by insects.
16.The typical person goes to the bathroom 6 times a day
17.After eating too much, your hearing is less sharp.
18.Your urine will turn bright yellow if you eat too much asparagus.
19.There are more people alive today than have ever died in the entire existence of  the world.
20.Americans (as of 2008) are on average 25 pounds heaver than Americans in 1965. 
21.American adults (as of 2009) spend 1/3 of the day (8 hrs.) looking at screens (TV, computer, phone, GPS, etc.).
22.An average person laughs about 5 times a day.
23.Eating breakfast will help you burn from 5-20% more calories throughout the day.