The word “muscle” is from the Latin word musculus, or “little mouse.” The Romans thought a flexing muscle looked like a mouse moving under the skin.

Some people suffer from Exploding Head Syndrome, which causes them to hear a loud bang when they wake up. It is not painful, but the sensation can be terrifying. It’s not clear what causes this, but according to the American Sleep Association, anxiety and stress may play a role.

The brain is more active at night than during the day. Scientists don’t know yet why this is.

The average human body contains enough sulphur to kill all the fleas on the average dog, enough carbon to make 900 pencils, enough potassium to fire a toy cannon, enough fat to make seven bars of soap and enough water to fill a 50-liter barrel.

Your nose shapes the sound of your voice.

Between birth and death, the human body goes from having 300 bones, to just 206.

Your tongue can get fat.

Men have erections every hour to hour and a half during sleep. This is because the combination of blood circulation and testosterone production can cause erections during sleep and are a necessary part of REM sleep.

When a baby is born, their blood volume is comparable to a can of soda

The human sense of smell has the ability to identify the chemical smell of an object in one part per trillion of air.

Without the lens, the human eye can see some of the UV spectrum.

There are so many nerve cells in a human brain that it would take almost 3,000 years to count them.

Nerve impulses can travel as fast as 170 miles per hour.

The average life expectancy is 2,475,576,000 seconds. During this time we pronounce, on average, around 123,205,750 words and have sex 4,239 times.

A condition called synesthesia can cause senses to overlap. In other words, some people can taste words or hear colors.

If you remove the minerals from a bone by soaking it overnight in a six percent solution of hydrochloric acid, it will become so soft, you could tie it in a knot.

The human body contains enough fat to make seven bars of soap.

Natural blondes have more hair than natural brunettes. Natural blondes have approximately 120,000-147,000 hairs, while brunettes have 100,000-120,000. This makes perfect sense, as evolutionary biology tells us that hair evolved partially to protect the scalp from potentially damaging UV rays.

On average, the number of connections in the brain increases from 50 trillion to 1 quadrillion in a newborn during his first month of life.

Your body contains enough blood to satisfy the appetites of 1,000,000 mosquitoes.

Stomach acid can dissolve metal. If it touched your skin, it would burn right through it.

In camera terms, the human eye is about 576 megapixels.

50 percent of your hand strength comes from your pinky finger.

Fecal bacteria may get on toothbrushes if you don’t put the toilet lid down when flushing.

Feces can get through 10 layers of toilet paper that is not high-quality.

In human embryos, the anus is formed first and then the mouth, this is why people are in the deuterostome class.

Squeezing out pimples near the nose and the nasal folds may be extremely dangerous for your health. Scientists call this area the triangle of death, because it is directly connected to the brain through blood vessels, so an infection can spread very rapidly.

The main ingredient of perfumes is ambergris — a substance found in the digestive tract of sperm whales. Even after applying alcohol to it, it still smells a lot like feces.

Samples of beauty products in stores contain pathogenic bacteria that can cause eye and skin infections.

The British lose 99,000 liters of beer every year in their mustaches and beards.

Rap battles are not something that have appeared only recently. Telling each other insults in poems was popular in England and Scotland from the 5th to the 16th century.

In 2008, more than 50% of British teenagers thought that Sherlock Holmes was a real person and 25% of them thought that Winston Churchill was a fictional character.

The chance of dying in an accident (for example, while driving) is 5 times higher for southpaws than for righties.

By the age of 50-60, people lose about 50% of their taste receptors.

The human body doesn’t see the eyes as its own organ. But a special protective barrier doesn’t let the immune cells get to the eyes and destroy them. This is called the privileged immunity of organs.

In public swimming pools, there are on average 75 liters of urine.

The human body has as many bacteria as it has cells: about 10 trillion.

People that drink coffee regularly swallow about 140,000 insect fragments a year (most of them are completely harmless).

On the way to the top of Everest, there are at least 250 bodies of climbers that have died on the way. It is impossible to take them down because it is too dangerous. Some bodies even work as pointers: climbers can tell the altitude because they know where certain bodies are.

If you can smell something, it means that the molecules of whatever it is are already in your nose.

Despite the fact that cats transmit toxoplasmosis that can lead to brain damage, the risk of catching schizophrenia from a home pet is very low.

Puppies like squeaking toys because the sound reminds them of the sound of prey.

It would take 1 million mosquitos to drink all the blood of one person.

Sloths defecate only once a week because they have very slow digestion.

During the first months of their lives, koala cubs eat the excrement of their mothers: this is how they learn to digest the eucalyptus that they are going to have to eat.