100 Interesting Facts
About the Human Body

The human body is an incredibly complex and intricate system, one that still baffles doctors and
researchers on a regular basis despite thousands of years of medical knowledge. As a result, it
shouldn’t be any surprise that even body parts and functions we deal with every day have bizarre
or unexpected facts and explanations behind them. From sneezes to fingernail growth, here are
100 weird, wacky, and interesting facts about the human body.

The Brain

The human brain is the most complex and least understood part of the human anatomy. There
may be a lot we don’t know, but here are a few interesting facts that we’ve got covered.
1. Nerve impulses to and from the brain travel as fast as 170 miles per hour. Ever
wonder how you can react so fast to things around you or why that stubbed toe hurts right
away? It’s due to the superspeedy movement of nerve impulses from your brain to the
rest of your body and vice versa, bringing reactions at the speed of a high powered luxury
sports car.
2. The brain operates on the same amount of power as 10 watt light bulb. The cartoon
image of a light bulb over your head when a great thought occurs isn’t too far off the
mark. Your brain generates as much energy as a small light bulb even when you’re
3. The human brain cell can hold 5 times as much information as the Encyclopedia
Britannica. Or any other encyclopedia for that matter. Scientists have yet to settle on a
definitive amount, but the storage capacity of the brain in electronic terms is thought to
be between 3 or even 1,000 terabytes. The National Archives of Britain, containing over
900 years of history, only takes up 70 terabytes, making your brain’s memory power
pretty darn impressive.
4. Your brain uses 20% of the oxygen that enters your bloodstream. The brain only
makes up about 2% of our body mass, yet consumes more oxygen than any other organ in
the body, making it extremely susceptible to damage related to oxygen deprivation. So
breathe deep to keep your brain happy and swimming in oxygenated cells.
5. The brain is much more active at night than during the day. Logically, you would
think that all the moving around, complicated calculations and tasks and general
interaction we do on a daily basis during our working hours would take a lot more brain
power than, say, lying in bed. Turns out, the opposite is true. When you turn off your
brain turns on. Scientists don’t yet know why this is but you can thank the hard work of
your brain while you sleep for all those pleasant dreams.
6. Scientists say the higher your I.Q. the more you dream. While this may be true, don’t
take it as a sign you’re mentally lacking if you can’t recall your dreams. Most of us don’t
remember many of our dreams and the average length of most dreams is only 23
seconds–barely long enough to register.
7. Neurons continue to grow throughout human life. For years scientists and doctors
thought that brain and neural tissue couldn’t grow or regenerate. While it doesn’t act in
the same manner as tissues in many other parts of the body, neurons can and do grow
throughout your life, adding a whole new dimension to the study of the brain and the
illnesses that affect it.
8. Information travels at different speeds within different types of neurons. Not all
neurons are the same. There are a few different types within the body and transmission
along these different kinds can be as slow as 0.5 meters/sec or as fast as 120 meters/sec.
9. The brain itself cannot feel pain. While the brain might be the pain center when you cut
your finger or burn yourself, the brain itself does not have pain receptors and cannot feel
pain. That doesn’t mean your head can’t hurt. The brain is surrounded by loads of tissues,
nerves and blood vessels that are plenty receptive to pain and can give you a pounding
10. 80% of the brain is water. Your brain isn’t the firm, gray mass you’ve seen on TV.
Living brain tissue is a squishy, pink and jelly-like organ thanks to the loads of blood and
high water content of the tissue. So the next time you’re feeling dehydrated get a drink to
keep your brain hydrated.

Hair and Nails

While they’re not a living part of your body, most people spend a good amount of time caring for
their hair and nails. The next time you’re heading in for a haircut or manicure, think of these
11. Facial hair grows faster than any other hair on the body. If you’ve ever had a
covering of stubble on your face as you’re clocking out at 5 o’clock you’re probably
pretty familiar with this. In fact, if the average man never shaved his beard it would grow
to over 30 feet during his lifetime, longer than a killer whale.
12. Every day the average person loses 60100 strands of hair. Unless you’re already
bald, chances are good that you’re shedding pretty heavily on a daily basis. Your hair loss
will vary in accordance with the season, pregnancy, illness, diet and age.
13. Women’s hair is about half the diameter of men’s hair. While it might sound strange,
it shouldn’t come as too much of a surprise that men’s hair should be coarser than that of
women. Hair diameter also varies on average between races, making hair plugs on some
men look especially obvious.
14. One human hair can support 3.5 ounces. That’s about the weight of two full size candy
bars, and with hundreds of thousands of hairs on the human head, makes the tale of
Rapunzel much more plausible.
15. The fastest growing nail is on the middle finger. And the nail on the middle finger of
your dominant hand will grow the fastest of all. Why is not entirely known, but nail
growth is related to the length of the finger, with the longest fingers growing nails the
fastest and shortest the slowest.
16. There are as many hairs per square inch on your body as a chimpanzee. Humans are
not quite the naked apes that we’re made out to be. We have lots of hair, but on most of
us it’s not obvious as a majority of the hairs are too fine or light to be seen.
17. Blondes have more hair. They’re said to have more fun, and they definitely have more
hair. Hair color determines how dense the hair on your head is. The average human has
100,000 hair follicles, each of which is capable of producing 20 individual hairs during a
person’s lifetime. Blondes average 146,000 follicles while people with black hair tend to
have about 110,000 follicles. Those with brown hair fit the average with 100,000 follicles
and redheads have the least dense hair, with about 86,000 follicles.
18. Fingernails grow nearly 4 times faster than toenails. If you notice that you’re
trimming your fingernails much more frequently than your toenails you’re not just
imagining it. The nails that get the most exposure and are used most frequently grow the
fastest. On average, nails on both the toes and fingers grow about one tenth
of an inch each month.
19. The lifespan of a human hair is 3 to 7 years on average. While you quite a few hairs
each day, your hairs actually have a pretty long life providing they aren’t subject to any
trauma. Your hairs will likely get to see several different haircuts, styles, and even
possibly decades before they fall out on their own.
20. You must lose over 50% of your scalp hairs before it is apparent to anyone. You lose
hundreds of hairs a day but you’ll have to lose a lot more before you or anyone else will
notice. Half of the hairs on your pretty little head will have to disappear before your
impending baldness will become obvious to all those around you.
21. Human hair is virtually indestructible. Aside from it’s flammability, human hair
decays at such a slow rate that it is practically nondisintegrative.
If you’ve ever wondered how your how clogs up your pipes so quick consider this: hair cannot be
destroyed by cold, change of climate, water, or other natural forces and it is resistant to
many kinds of acids and corrosive chemicals.

Internal Organs

Though we may not give them much thought unless they’re bothering us, our internal organs are
what allow us to go on eating, breathing and walking around. Here are some things to consider
the next time you hear your stomach growl.
22. The largest internal organ is the small intestine. Despite being called the smaller of the
two intestines, your small intestine is actually four times as long as the average adult is
tall. If it weren’t looped back and forth upon itself it wouldn’t fit inside the abdominal
23. The human heart creates enough pressure to squirt blood 30 feet. No wonder you can
feel your heartbeat so easily. Pumping blood through your body quickly and efficiently
takes quite a bit of pressure resulting in the strong contractions of the heart and the thick
walls of the ventricles which push blood to the body.
24. The acid in your stomach is strong enough to dissolve razorblades. While you
certainly shouldn’t test the fortitude of your stomach by eating a razorblade or any other
metal object for that matter, the acids that digest the food you eat aren’t to be taken
lightly. Hydrochloric acid, the type found in your stomach, is not only good at dissolving
the pizza you had for dinner but can also eat through many types of metal.
25. The human body is estimated to have 60,000 miles of blood vessels. To put that in
perspective, the distance around the earth is about 25,000 miles, making the distance your
blood vessels could travel if laid end to end more than two times around the earth.
26. You get a new stomach lining every three to four days. The mucuslike
cells lining the walls of the stomach would soon dissolve due to the strong digestive acids in your
stomach if they weren’t constantly replaced. Those with ulcers know how painful it can
be when stomach acid takes its toll on the lining of your stomach.
27. The surface area of a human lung is equal to a tennis court. In order to more
efficiently oxygenate the blood, the lungs are filled with thousands of branching bronchi
and tiny, grapelike alveoli. These are filled with microscopic capillaries which oxygen
and carbon dioxide. The large amount of surface area makes it easier for this exchange to
take place, and makes sure you stay properly oxygenated at all times.
28. Women’s hearts beat faster than men’s.The main reason for this is simply that on
average women tend to be smaller than men and have less mass to pump blood to. But
women’s and men’s hearts can actually act quite differently, especially when
experiencing trauma like a heart attack, and many treatments that work for men must be
adjusted or changed entirely to work for women.
29. Scientists have counted over 500 different liver functions. You may not think much
about your liver except after a long night of drinking, but the liver is one of the body’s
hardest working, largest and busiest organs. Some of the functions your liver performs
are: production of bile, decomposition of red blood cells, plasma protein synthesis, and
30. The aorta is nearly the diameter of a garden hose. The average adult heart is about the
size of two fists, making the size of the aorta quite impressive. The artery needs to be so
large as it is the main supplier of rich, oxygenated blood to the rest of the body.
31. Your left lung is smaller than your right lung to make room for your heart. For most
people, if they were asked to draw a picture of what the lungs look like they would draw
both looking roughly the same size. While the lungs are fairly similar in size, the human
heart, though located fairly centrally, is tilted slightly to the left making it take up more
room on that side of the body and crowding out that poor left lung.
32. You could remove a large part of your internal organs and survive. The human body
may appear fragile but it’s possible to survive even with the removal of the stomach, the
spleen, 75 percent of the liver, 80 percent of the intestines, one kidney, one lung, and
virtually every organ from the pelvic and groin area. You might not feel too great, but the
missing organs wouldn’t kill you.
33. The adrenal glands change size throughout life. The adrenal glands, lying right above
the kidneys, are responsible for releasing stress hormones like cortisol and adrenaline. In
the seventh month of a fetus’ development, the glands are roughly the same size as the
kidneys. At birth, the glands have shrunk slightly and will continue to do so throughout
life. In fact, by the time a person reaches old age, the glands are so small they can hardly
be seen.

Bodily Functions

We may not always like to talk about them, but everyone has to deal with bodily functions on a
daily basis. These are a few facts about the involuntary and sometimes unpleasant actions of our
34. Sneezes regularly exceed 100 mph. There’s a good reason why you can’t keep your
eyes open when you sneeze–that sneeze is rocketing out of your body at close to 100
mph. This is, of course, a good reason to cover your mouth when you sneeze.
35. Coughs clock in at about 60 mph. Viruses and colds get spread around the office and
the classroom quickly during cold and flu season. With 60 mph coughs spraying germs
far and wide, it’s no wonder.
36. Women blink twice as many times as men do. That’s a lot of blinking every day. The
average person, man or woman, blinks about 13 times a minute.
37. A full bladder is roughly the size of a soft ball. No wonder you have to run to bathroom
when you feel the call of the wild. The average bladder holds about 400-800 cc of fluid
but most people will feel the urge to go long before that at 250 to 300 cc.
38. Approximately 75% of human waste is made of water. While we might typically think
that urine is the liquid part of human waste products, the truth is that what we consider
solid waste is actually mostly water as well. You should be thankful that most waste is
fairly waterfilled, as drier harder stools are what cause constipation and are much harder
and sometimes painful to pass.
39. Feet have 500,000 sweat glands and can produce more than a pint of sweat a day.
With that kind of sweat-producing power it’s no wonder that your gym shoes have a
stench that can peel paint. Additionally, men usually have much more active sweat glands
than women.
40. During your lifetime, you will produce enough saliva to fill two swimming pools.
Saliva plays an important part in beginning the digestive process and keeping the mouth
lubricated, and your mouth produces quite a bit of it on a daily basis.
41. The average person expels flatulence 14 times each day. Even if you’d like to think
you’re too dignified to pass gas, the reality is that almost everyone will at least a few
times a day. Digestion causes the body to release gases which can be painful if trapped in
the abdomen and not released.
42. Earwax production is necessary for good ear health. While many people find earwax
to be disgusting, it’s actually a very important part of your ear’s defense system. It
protects the delicate inner ear from bacteria, fungus, dirt and even insects. It also cleans
and lubricates the ear canal.

Sex and Reproduction

As taboo as it may be in some places, sex is an important part of human life as a facet of
relationships and the means to reproduce. Here are a few things you might not have known.
43. On any given day, sexual intercourse takes place 120 million times on earth. Humans
are a quickly proliferating species, and with about 4% of the world’s population having
sex on any given day, it’s no wonder that birth rates continue to increase in many places
all over the world.
44. The largest cell in the human body is the female egg and the smallest is the male
sperm. While you can’t see skin cells or muscle cells, the ovum is typically large enough
to be seen with the naked eye with a diameter of about a millimeter. The sperm cell, on
the other hand, is tiny, consisting of little more than nucleus.
45. The three things pregnant women dream most of during their first trimester are
frogs, worms and potted plants. Pregnancy hormones can cause mood swings, cravings
and many other unexpected changes. Oddly enough, hormones can often affect the types
of dreams women have and their vividness. The most common are these three types, but
many women also dream of water, giving birth or even have violent or sexually charged
46. Your teeth start growing 6 months before you are born. While few babies are born
with teeth in place, the teeth that will eventually push through the gums of young children
are formed long before the child even leaves the womb. At 9 to 12 weeks the fetus starts
to form the teeth buds that will turn into baby teeth.
47. Babies are always born with blue eyes. The color of your eyes depends on the genes
you get from your parents, but at birth most babies appear to have blue eyes. The reason
behind this is the pigment melanin. The melanin in a newborn’s eyes often needs time
after birth to be fully deposited or to be darkened by exposure to ultraviolet light, later
revealing the baby’s true eye color.
48. Babies are, pound for pound, stronger than an ox. While a baby certainly couldn’t
pull a covered wagon at its present size, if the child were the size of an oxen it just might
very well be able to. Babies have especially strong and powerful legs for such tiny
creatures, so watch out for those kicks.
49. One out of every 2,000 newborn infants has a tooth when they are born. Nursing
mothers may cringe at this fact. Sometimes the tooth is a regular baby tooth that has
already erupted and sometimes it is an extra tooth that will fall out before the other set of
choppers comes in.
50. A fetus acquires fingerprints at the age of three months. When only a small fraction
of the way through its development, a fetus will have already developed one of the most
unique human traits: fingerprints. At only 613
weeks of development, the whorls of what
will be fingerprints have already developed. Oddly enough, those fingerprints will not
change throughout the person’s life and will be one of the last things to disappear after
51. Every human spent about half an hour as a single cell. All life has to begin
somewhere, and even the largest humans spent a short part of their lives as a single celled
organism when sperm and egg cells first combine. Shortly afterward, the cells begin
rapidly dividing and begin forming the components of a tiny embryo.
52. Most men have erections every hour to hour and a half during sleep. Most people’s
bodies and minds are much more active when they’re sleeping than they think. The
combination of blood circulation and testosterone production can cause erections during
sleep and they’re often a normal and necessary part of REM sleep.


The primary means by which we interact with the world around us is through our senses. Here
are some interesting facts about these five sensory abilities.

53. After eating too much, your hearing is less sharp. If you’re heading to a concert or a
musical after a big meal you may be doing yourself a disservice. Try eating a smaller
meal if you need to keep your hearing pitch perfect.
54. About one third of the human race has 20-20 vision. Glasses and contact wearers are
hardly alone in a world where two thirds of the population have less than perfect vision.
The amount of people with perfect vision decreases further as they age.
55. If saliva cannot dissolve something, you cannot taste it. In order for foods, or anything
else, to have a taste, chemicals from the substance must be dissolved by saliva. If you
don’t believe it, try drying off your tongue before tasting something.
56. Women are born better smellers than men and remain better smellers over life.
Studies have shown that women are more able to correctly pinpoint just what a smell is.
Women were better able to identify citrus, vanilla, cinnamon and coffee smells. While
women are overall better smellers, there is an unfortunate 2% of the population with no
sense of smell at all.
57. Your nose can remember 50,000 different scents. While a bloodhound’s nose may be a
million times more sensitive than a human’s, that doesn’t mean that the human sense of
smell is useless. Humans can identify a wide variety of scents and many are strongly tied
to memories.
58. Even small noises cause the pupils of the eyes to dilate. It is believed that this is why
surgeons, watchmakers and others who perform delicate manual operations are so
bothered by uninvited noise. The sound causes their pupils to change focus and blur their
vision, making it harder to do their job well.
59. Everyone has a unique smell, except for identical twins. Newborns are able to
recognize the smell of their mothers and many of us can pinpoint the smell of our
significant others and those we are close to. Part of that smell is determined by genetics,
but it’s also largely do to environment, diet and personal hygiene products that create a
unique chemistry for each person.

Aging and Death

From the very young to the very old, aging is a necessary and unavoidable part of life. Learn
about the process with these interesting, if somewhat strange facts.
60. The ashes of a cremated person average about 9 pounds. A big part of what gives the
human body weight is the water trapped in our cells. Once cremated, that water and a
majority of our tissues are destroyed, leaving little behind.
61. Nails and hair do not continue to grow after we die. They do appear longer when we
die, however, as the skin dehydrates and pulls back from the nail beds and scalp.
62. By the age of 60, most people will have lost about half their taste buds. Perhaps you
shouldn’t trust your grandma’s cooking as much as you do. Older individuals tend to lose
their ability to taste, and many find that they need much more intense flavoring in order
to be able to fully appreciate a dish.
63. Your eyes are always the same size from birth but your nose and ears never stop
growing. When babies look up at you with those big eyes, they’re the same size that
they’ll be carrying around in their bodies for the rest of their lives. Their ears and nose,
however, will grow throughout their lives and research has shown that growth peaks in
seven year cycles.
64. By 60 years of age, 60percent of men and 40percent of women will snore. If you’ve
ever been kept awake by a snoring loved one you know the sound can be deafening.
Normal snores average around 60 decibels, the noise level of normal speech, intense
snores can reach more than 80 decibels, the approximate level caused by a jackhammer
breaking up concrete.
65. A baby’s head is one quarter of it’s total length, but by age 25 will only be one eighth
of its total length. As it turns out, our adorably oversized baby heads won’t change size
as drastically as the rest of our body. The legs and torso will lengthen, but the
head won’t get much longer.

Disease and Injury

Most of us will get injured or sick at some point in our lives. Here are some facts on how the
human body reacts to the stresses and dangers from the outside world.
66. Monday is the day of the week when the risk of heart attack is greatest. Yet another
reason to loathe Mondays! A ten year study in Scotland found that 20% more people die
of heart attacks on Mondays than any other day of the week. Researchers theorize that it’s
a combination of too much fun over the weekend with the stress of going back to work
that causes the increase.
67. Humans can make do longer without food than sleep. While you might feel better
prepared to stay up all night partying than to give up eating, that feeling will be relatively
short lived. Provided there is water, the average human could survive a month to two
months without food depending on their body fat and other factors. Sleep deprived
people, however, start experiencing radical personality and psychological changes after
only a few sleepless days. The longest recorded time anyone has ever gone without sleep
is 11 days, at the end of which the experimenter was awake, but stumbled over words,
hallucinated and frequently forgot what he was doing.
68. A simple, moderately severe sunburn damages the blood vessels extensively. How
extensively? Studies have shown that it can take four to fifteen months for them to return
to their normal condition. Consider that the next time you’re feeling too lazy to apply
sunscreen before heading outside.
69. Over 90% of diseases are caused or complicated by stress. That high stress job you
have could be doing more than just wearing you down each day. It could also be
increasing your chances of having a variety of serious medical conditions like depression,
high blood pressure and heart disease.
70. A human head remains conscious for about 15 to 20 seconds after it is been
decapitated. While it might be gross to think about, the blood in the head may be enough
to keep someone alive and conscious for a few seconds after the head has been separated
from the body, though reports as to the accuracy of this are widely varying.

Muscles and Bones

Muscles and Bones provide the framework for our bodies and allow us to jump, run or just lie on
the couch. Here are a few facts to ponder the next time you’re lying around.
71. It takes 17 muscles to smile and 43 to frown. Unless you’re trying to give your face a
bit of a workout, smiling is a much easier option for most of us. Anyone who’s ever
scowled, squinted or frowned for a long period of time knows how it tires out the face
which doesn’t do a thing to improve your mood.
72. Babies are born with 300 bones, but by adulthood the number is reduced to 206. The
reason for this is that many of the bones of children are composed of smaller component
bones that are not yet fused like those in the skull. This makes it easier for the baby to
pass through the birth canal. The bones harden and fuse as the children grow.
73. We are about 1 cm taller in the morning than in the evening. The cartilage between
our bones gets compressed by standing, sitting and other daily activities as the day goes
on, making us just a little shorter at the end of the day than at the beginning.
74. The strongest muscle in the human body is the tongue. While you may not be able to
bench press much with your tongue, it is in fact the strongest muscle in your body in
proportion to its size. If you think about it, every time you eat, swallow or talk you use
your tongue, ensuring it gets quite a workout throughout the day.
75. The hardest bone in the human body is the jawbone. The next time someone suggests
you take it on the chin, you might be well advised to take their advice as the jawbone is
one of the most durable and hard to break bones in the body.
76. You use 200 muscles to take one step. Depending on how you divide up muscle groups,
just to take a single step you use somewhere in the neighborhood of 200 muscles. That’s
a lot of work for the muscles considering most of us take about 10,000 steps a day.
77. The tooth is the only part of the human body that can’t repair itself. If you’ve ever
chipped a tooth you know just how sadly true this one is. The outer layer of the tooth is
enamel which is not a living tissue. Since it’s not alive, it can’t repair itself, leaving your
dentist to do the work instead.
78. It takes twice as long to lose new muscle if you stop working out than it did to gain
it. Lazy people out there shouldn’t use this as motivation to not work out, however. It’s
relatively easy to build new muscle tissue and get your muscles in shape, so if anything,
this fact should be motivation to get off the couch and get moving.
79. Bone is stronger than some steel. This doesn’t mean your bones can’t break of course,
as they are much less dense than steel. Bone has been found to have a tensile strength of
20,000 psi while steel is much higher at 70,000 psi. Steel is much heavier than bone,
however, and pound for pound bone is the stronger material.
80. The feet account for one quarter of all the human body’s bones. You may not give
your feet much thought but they are home to more bones than any other part of your
body. How many? Of the two hundred or so bones in the body, the feet contain a
whopping 52 of them.

Microscopic Level

Much of what takes place in our bodies happens at a level that we simply can’t see with the
naked eye. These facts will show you that sometimes that might be for the best.

81. About 32 million bacteria call every inch of your skin home. Germaphobes don’t need
to worry however, as a majority of these are entirely harmless and some are even helpful
in maintaining a healthy body.
82. Humans shed and regrow outer skin cells about every 27 days. Skin protects your
delicate internal organs from the elements and as such, dries and flakes off completely
about once a month so that it can maintain its strength. Chances are that last month’s skin
is still hanging around your house in the form of the dust on your bookshelf or under the
83. Three hundred million cells die in the human body every minute. While that sounds
like a lot, it’s really just a small fraction of the cells that are in the human body. Estimates
have placed the total number of cells in the body at 1050 trillion so you can afford to
lose a few hundred million without a hitch.
84. Humans shed about 600,000 particles of skin every hour. You may not think much
about losing skin if yours isn’t dry or flaky or peeling from a sunburn, but your skin is
constantly renewing itself and shedding dead cells.
85. Every day an adult body produces 300 billion new cells. Your body not only needs
energy to keep your organs up and running but also to constantly repair and build new
cells to form the building blocks of your body itself.
86. Every tongue print is unique. If you’re planning on committing a crime, don’t think
you’ll get away with leaving a tongue print behind. Each tongue is different and yours
could be unique enough to finger you as the culprit.
87. Your body has enough iron in it to make a nail 3 inches long. Anyone who has ever
tasted blood knows that it has a slightly metallic taste. This is due to the high levels of
iron in the blood. If you were to take all of this iron out of the body, you’d have enough
to make a small nail and very severe anemia.
88. The most common blood type in the world is Type O. Blood banks find it valuable as
it can be given to those with both type A and B blood. The rarest blood type, AH
or Bombay blood due to the location of its discovery, has been found in less than hundred
people since it was discovered.
89. Human lips have a reddish color because of the great concentration of tiny
capillaries just below the skin. The blood in these capillaries is normally highly
oxygenated and therefore quite red. This explains why the lips appear pale when a person
is anemic or has lost a great deal of blood. It also explains why the lips turn blue in very
cold weather. Cold causes the capillaries to constrict, and the blood loses oxygen and
changes to a darker color.


Here are a few things you might not have known about all different parts of your anatomy.
90. The colder the room you sleep in, the better the chances are that you’ll have a bad
dream. It isn’t entirely clear to scientists why this is the case, but if you are opposed to
having nightmares you might want to keep yourself a little toastier at night.
91. Tears and mucus contain an enzyme (lysozyme) that breaks down the cell wall of
many bacteria. This is to your advantage, as the mucus that lines your nose and throat,
as well as the tears that wet your eyes are helping to prevent bacteria from infecting those
areas and making you sick.
92. Your body gives off enough heat in 30 minutes to bring half a gallon of water to a
boil. If you’ve seen the Matrix you are aware of the energy potentially generated by the
human body. Our bodies expend a large amount of calories keeping us at a steady 98.6
degrees, enough to boil water or even cook pasta.
93. Your ears secrete more earwax when you are afraid than when you aren’t. The
chemicals and hormones released when you are afraid could be having unseen effects on
your body in the form of earwax. Studies have suggested that fear causes the ears to
produce more of the sticky substance, though the reasons are not yet clear.
94. It is not possible to tickle yourself. Even the most ticklish among us do not have the
ability to tickle ourselves. The reason behind this is that your brain predicts the tickle
from information it already has, like how your fingers are moving. Because it knows and
can feel where the tickle is coming from, your brain doesn’t respond in the same way as it
would if someone else was doing the tickling.
95. The width of your armspan stretched out is the length of your whole body. While not
exact down to the last millimeter, your armspan is a pretty good estimator of your height.
96. Humans are the only animals to produce emotional tears. In the animal world,
humans are the biggest crybabies, being the only animals who cry because they’ve had a
bad day, lost a loved one, or just don’t feel good.
97. Right-handed people live, on average, nine years longer than lefthanded
people do. This doesn’t have a genetic basis, but is largely due to the fact that a majority of the
machines and tools we use on a daily basis are designed for those who are right handed,
making them somewhat dangerous for lefties to use and resulting in thousands of
accidents and deaths each year.
98. Women burn fat more slowly than men, by a rate of about 50 calories a day. Most
men have a much easier time burning fat than women. Women, because of their
reproductive role, generally require a higher basic body fat proportion than men, and as a
result their bodies don’t get rid of excess fat at the same rate as men.
99. Koalas and primates are the only animals with unique fingerprints. Humans, apes
and koalas are unique in the animal kingdom due to the tiny prints on the fingers of their
hands. Studies on primates have suggested that even cloned individuals have unique
100. The indentation in the middle of the area between the nose and the upper lip
has a name. It is called the philtrum. Scientists have yet to figure out what purpose this
indentation serves, though the ancient Greeks thought it to be one of the most erogenous
places on the body.

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