We have billions of nuerons throughout our bodies that need direction. The brain is in charge of giving that direction and it does so by sending out electrical impulses. Those electrical impulses, if combined, could power a low-watt lightbulb.

Although you may have heard differently, having a broken heart is an actual medical condition. It’s fittingly called broken heart syndrome and takes place after a traumatic event. If you suffer from this ailment, you may experience shortness of breath, pain, and even a heart attack.

You may already know that your stomach is filled with acid that breaks down your food. But do you know just how powerful your stomach acid is? If it were to escape your stomach, it could easily burn a hole through your skin.

The human mouth is filled with bacteria–and the amount of bacteria is pretty shocking. There are over 600 different types of bacteria in your mouth right now, with the levels of bacteria numbering in the billions. That kind of makes you rethink kissing strangers doesn’t it?

Our bodies are filled with blood vessels and they stretch much further than you might think. If they were lined up end to end, our blood vessels would reach a distance of 60,000 to 100,000 miles. That’s enough to circumnavigate the globe twice.

There are so many things in this world that are just so small, we don’t even notice them. Demodex are a perfect example. They are a type of tiny mite that actually live on your eyelashes and other hair follicles.

When we wake up in the morning, we are at our tallest. This is because our spine has had a chance to decompress while we slept. However. as we go about our day, gravity pushes down on our spine and causes us to shrink a bit. So at night, just before bed, we are actually shorter than when we woke up.

I think we can all agree that music has the ability to alter our mood. But did you know that it has actual physiological effects on our bodies? The heart, for example, will synchronize itself with the beat of the song that we are listening to and our blood vessels will constrict as a song crescendoes.

There are enzymes inside of our bodies right now and they help us do things like digest our food. However, that’s not all that they do. They also feed on the bodily fluids that are produced inside of us after we die. We essentially eat ourselves alive… well, eat ourselves dead, actually.

The heart is an incredible organ. It pumps blood throughout our body every single day and night for our entire lives. It works so hard that it typically pumps about 100,000 times a day and will pump six times faster during workouts.

When some woman are pregnant, their brains actually begin to shrink. It’s not permanent, but it can take up to 6 months for the brain to get back to its normal size.

The tiny bones in our feet may seem somewhat insignificant compared to our giant leg and arm bones. However, our feet bones are very important. So important, in fact, that of all the bones in our entire body, 25% of them can be found in our feet.

Our bodies contain both a large and small intestine. The small intestine is about 20 feet long while the large intestine is around 5 feet. If you were to combine the two and stretch them out, they would reach a length that is equal to the height of a three-story building.

Our teeth need to be strong in order to break down hard foods. However, just how strong our teeth are is largely unknown. For comparison, our teeth are as strong as sharks’ teeth.

When we are born, our body is comprised of at least 300 bones. However, by the time that we reach adulthood, our bodies only contain 212. How is this possible? Well, as we grow, some of our bones fuse, leaving us with fewer bones later on in life.

Skin is the largest organ that our body contains. Even so, it doesn’t seem like it would weigh very much. You may be surprised to learn that our skin weighs about 20 lbs or roughly 18% of our total body weight.

Blinking takes less than a second for our bodies to do. However, since we blink so often, our eyes are actually closed for about 10% of the total time that we are awake.

Believe it or not, our skin actually glows in the dark. The human body is bioluminescent, which means that it emits lights. The light is so faint, however, that it can’t be detected by the human eye.

During the 1940s it was very common for people to dream in black and white–about 75% of people, in fact. Black and white television was thought to have been the cause of this since the number of people who dream in back and white today has significantly decreased.

Humans shed tears for multiple reasons–mainly due to happiness or sadness. However, the type of tear that comes out of your eye is unique depending on why you are crying. Simply put, happy tears have a different composition than sad tears.

Do you have expensive taste? Well, that may not be entirely your fault. There is actually a disease called Gourmand Syndrome which causes you to be addicted to fine dining. It can take place after an injury to the right anterior cerebral hemisphere of the brain.

We already know how powerful the heart is. But did you know that it is capable of squirting blood up to 30 feet? I mean, it has 2,000 gallons of blood to pump throughout the body daily. It has to be strong.

Our livers are incredible organs. They have the ability to grow cells and regenerate even if they lose 75% of their original mass. Because of this, one liver can be transplanted into multiple people.

As we get older, our bodies change. We are born with about 10,000 taste buds, but by the age of 60, these will begin to deteriorate, and with it, our ability to taste. Be sure to enjoy those delicious treats while you still can.

We all know DNA as the carrier of our genetic code. But do you know just how long that code is? If you were to unwind our DNA and stretch it out, it would reach to the edge of our solar system and back.

When we are embarrassed, we tend to blush. Blushing occurs due to the widening of our capillaries. However, blushing doesn’t just take place in our cheeks and face. It can also be observed on the lining of our stomachs.

The muscles in our faces allow us to make some pretty crazy expressions. We are all familiar with the common ones–smile, frown, pout. But did you know that the human is capable of making over 7,000 different facial expressions? That’s pretty incredible.

Our hair is immune to the effects of almost everything. Besides fire, there really isn’t anything that can destroy hair–acids and chemicals included. After we die, our hair takes a long time to decompose.

There are plenty of ways that people try and relieve their stress. However, did you know that simply blowing on your thumb can help? Don’t believe me? Give it a try.

The human eye is very good at what it does. The average eye can see at a rate of 500 megapixels and has a vision field that spans 180 degrees. That’s better than most high-tech cameras.

Many of us probably believe that the skeleton that we are born with is the one that we are going to die with. However, this isn’t the case. Our bodies are constantly regenerating our bones and every decade, our skeleton is comprised of completely new bones.

If you weren’t already completely impressed by the human heart, here’s another incredible fact. The human heart is capable of beating while outside of the human body. This is what allows surgeons to complete around 5,000 heart transplants every single year.

Ever wonder what that little pink bump is on the inside of your eye? It’s actually the remnant of an inner eyelid. This is something that reptiles and amphibians have today, but something that evolved out of humans over millions of years.

Most of us probably thought that once we finished our growth spurt, we’d be that same height until we died. This isn’t the case. Instead, once we reach 30, we begin to shrink at a rate of about 1/2 an inch every 10 years.

This is one of those wild conditions that seem fake but aren’t. About 10% of the world’s population experiences Exploding Head Syndrome. Sufferers of this ailment will hear the sound of an explosion right before they fall asleep.

The body is filed will all kinds of bacteria, some good, some not-so-good. In fact, the human body has 10 times more bacteria in it than it does cells. Problems can arise when enormous numbers of non-beneficial microbial communities form inside of us.

The kidneys have a big job to perform. They have to filter the body’s 7 to 8 liters of blood at least 25 times every single day. If they were to fail, we wouldn’t live for long.

Believe it or not, kissing actually helps to prevent cavities. It does so by causing the mouth to produce more saliva. This saliva actually washes away plaque from the teeth. So go ahead, kiss all you want.

The human body is a direct product of its environment. It is believed that we contain 97% of the same atoms found in our galaxy. Because of this, about 93% of our body mass is actually stardust.

Saliva helps with digestion and keeps the mouth moisturized. To do this, the body produces about 1 to 2 liters of saliva every single day. Even just thinking about eating can cause the mouth to start salivating.