You carry the bacteria around with you everywhere that you go. It’s enough to fill a whole soup can. All in all, bacteria make up around one to two percent of body mass.

Both the human stomach and the face become red when blushing. It’s because it causes all of the capillaries in your body to widen. The increased blood flow is responsible for the red color.

There is a lot going on up there. The brain is constantly sending electrical signals and impulses between the billions of neurons. Combine them all together and you can power a low-watt bulb.

It is called broken heart syndrome and it’s entirely real. Emotional stress can cause chest pain and shortness of breath similar to a heart attack. It normally resolves within a few days or weeks.

We have many more facial muscles than our primate ancestors. Also, part of having no hair on the face means that our expressions are easier to see too. There are thousands of different possibilities.

The name for this weird experience is exploding head syndrome. It sounds like a loud gunshot or explosion and happens upon sleeping or awakening. It has been estimated that it affects up to 10% of the population.

One of the only real threats to hair is fire. Besides that, it decays at an extremely slow rate. It’s even resistant to various types of chemicals and acids.

It’s called Gourmand Syndrome. It happens due to an injury of the right anterior cerebral hemisphere of the brain. Afterward, the individual will show a preference for eating and thinking about fine foods.

Individual stomachs vary in levels of acidity. However, the hydrochloric acid produced by your body is not only strong enough to break down food but in many cases, it can even bore through a piece of wood.

It sounds strange, but blowing on your thumb is a great stress reliever. It works by cooling off the thumb and calming the pulse in it. This, in turn, causes your body to feel more relaxed in general.

The bacteria love the warm and moist environment. It thrives in there. There are at least 615 documented types of bacteria you might find, and their levels in your mouth can number in the billions.

Humans are born with at least 300 or more bones. However, many of these fuse together slowly over time. Adults ultimately end up with a total of 212 different bones.

Between the arteries, veins, and capillaries, there are a lot of blood vessels in the body. They are winding all throughout every inch of your limbs. Line them up and they would likely stretch between 60 to 100 thousand miles.

This estimate includes your whole field of vision spanning 180 degrees. It would take a very high-definition camera to match this. The eye is superior to most devices.

Bacteria are much more plentiful than actual cells. The giant microbial communities have a serious effect on health. Yet, they are still largely unstudied by scientists.

In the average adult, that means around 20 pounds or more of just skin. If you peeled it off and lined it up, it would cover an area of about 22 square feet. Now that is a lot of skin!

They inhibit other hair follicles too. It’s a little weird to think about. This species of mites is known as Demodex, and it’s possible that they are what is behind various skin disorders.

The bones are regenerating around the clock. At any one time, there is a large mix of old and new bones in the body. The process never stops, but as we age, it does slow down.

It is a living pump with a lot of pressure that can send blood flying all the way across a room. It is very strong. The heart pumps around 2000 gallons of blood every day.

This is mostly made up of the time spent blinking. A blink only lasts a split second, but we do it a lot. The average person blinks around 15 to 20 times per minute.

Every year, people lose about 1.5 pounds worth of skin. Over a lifetime, it works out to over 100 pounds. Although, day by day, it’s barely noticeable.

It comes out to around 180 liters of blood processed daily. The average body contains seven or eight liters in total. Kidney filtration is crucial to keeping your blood healthy.

We normally think about tumors growing on the skin or organs. However, there is a type of cyst called teratoma that involves tissues like bone, hair, and teeth. They can be removed by surgery.

It is an evolutionary remnant from the past. It used to be an inner eyelid similar to those that birds and reptiles have. After millions of years of evolution, there is not much left.

Your height is the tallest first thing in the morning when you wake up. Over the course of the day, your spine gets compressed. There is a gelatin-like material in between your discs that act as a cushion. It moves around while you sleep.

Take away three-quarters of the liver and it can still survive. It will slowly grow back over time. It is the only organ in the body that has the capacity to regenerate.

As people grow older, they also get shorter. It’s because the discs between the vertebrae start to flatten. It happens very slowly and most won’t even notice the change in height.

Depending on the beat and tempo of the music you are listening to, your heartbeat will speed up or slow down. Songs that have crescendos in them can cause blood vessels in the cardiovascular system to constrict.

Humans begin with about 10,000 taste buds. However, due to age, the way things taste changes over time. Taste buds really only last around ten days before changing.

After death, the enzymes begin working on you. The microbial organisms can feed on the fluids produced during autolysis — the process that occurs once you pass away.

When you kiss, your mouth produces more saliva. Getting your fluids secreting like this helps to wash away plaque. Less plaque means fewer cavities.

People have about 97% of the same atoms as the galaxy that we live in. As a result of supernovas, stars explode, and the dust forms into new planets, and ultimately, people. Around 93% of the mass of the body is actually stardust.

Our bodies are bioluminescent, meaning in the dark, we give off light. It’s just too faint to be seen by the human eye. Species like fireflies and some jellyfish exhibit this property much more strongly.

The heart contracts over 100,000 times every day. It is always pumping away. With exercise, it pumps up to six times as fast as normal too.

About three-quarters of Americans reported that they almost never saw color in their dreams back then. It is believed to be because of the exposure to black and white television and films. The percentage of people that report this phenomenon now is much smaller.

It’s enough to fill two to four water bottles. Your salivary glands can be triggered just by thinking about food. When you are eating, they work even harder.

An average adult blinks about ten times per minute. However, a baby will only blink once or twice in the same amount of time. They rarely close their eyes when they are awake.

DNA is made up of long coils. If unwound, your DNA would stretch all the way from Earth to Pluto and back again. In every single cell, there is about 2 meters worth of DNA.

The emotion that causes the tears to form matters. There are a total of three different types of tears. Each of them looks different when examined under a microscope.

This obviously varies on a person-to-person basis. Some people could be made into more or less soap. It all depends on the supply of fat reserves that they have.

After childbirth it can take six months before the brain returns to its normal size. It’s not a big change, but it is observable. Once the baby is delivered, the changes begin to slowly reverse.

It depends on how you measure strength. However, based on weight, the jaw muscle comes in first place. It can help your molars to chomp down with as much as 200 pounds of force.

You would think it would be the brain or literally anything else. However, it’s true. The second thing to develop is the mouth, which just opens up the possibilities for jokes even more.

By the 17th week of pregnancy, a fetus’ fingerprints are pretty much set. After this point, they won’t ever change for the rest of a person’s life. Every fingerprint is completely unique.

Each foot and ankle has a total of 26 bones. There are also 33 joints and over 100 muscles, tendons, and ligaments. It is an extremely complex area of your skeletal system.

Without gravity weighing down on your body all of the time, it can stretch out. Most astronauts come back from space slightly taller than before. The one who gained two inches was on the space station for about a year.

In addition, the large intestine of humans is around five feet long. If you combine both intestines together, it would make a rope that is long enough to repel out of a three-story building.

This situation can even be caused by extreme dieting. The scientific term for it is autophagy. It’s when the cells in the body start to consume small portions of themselves.

The individual survived. Normal human body temperature is 98.6° F. Anything above 100.4 is concerning. For most people, once you hit around 107, multiple organ failure starts to occur.

Although the teeth of sharks are made from a harder mineral than human teeth, they are still similar in strength. It is largely due to the enamel coating on them. The enamel is comparable in each species.

While on the topic of organs, it’s important to realize they aren’t always entirely symmetrical either. The position of the kidneys in the body is different. It’s pretty interesting.

A lot of other animals can. However, not humans. It’s because of the placement of our voice box. It’s either one or the other.

They probably won’t start asking you to do a print of your tongue in police stations anytime soon though. The tongue print needs to be recorded using a 3D imaging machine. They aren’t exactly cheap.

You wouldn’t necessarily even know. Your cells are constantly dividing, but the body is pretty good at catching errors. If a cell notices that something is wrong, it is normally able to realize it’s broken and commit suicide before it gets out of control.