There are just as many bacterial cells as human cells in the body
Each human is made of trillions of cells. In fact, it is estimated that there are 37.2 trillion cells in the human body. If you think that’s a lot, wait until you find out how many of those are actually bacterial cells. According to a recent study, the human body contains just as many bacterial cells as human cells.
But don’t worry, they aren’t bad. Many bacteria are actually beneficial to the body. In fact, not having the right amount of bacteria can lead to skin diseases, gum disease, or other health problems.
All your blood vessels lined up in a row could go around the Earth twice
Blood vessels transport blood throughout the body. Did you know that if you lined up all the blood vessels in an average child, that line would be over 96,000 kilometres (60,000 miles) long? That’s more than twice the Earth’s circumference.
A single drop of blood contains up to 25,000 white blood cells
White blood cells are like soldiers who protect your body from bacteria and viruses. Your body has a whole army of them. In fact, there are anywhere from 7,000 to 25,000 white blood cells in a single drop of blood.
People tend to think that having more white blood cells means better protection. Actually, a high white blood cell count can indicate a serious disease. For example, a person suffering from leukemia may have as many as 50,000 white blood cells in a single drop of blood. Having too many is no better than not having enough!
A fingernail grows back in about six months
Did you know that fingernails grow faster than toenails? A fingernail will grow back in four to six months, whereas a toenail can take up to 10 months to grow. Be patient!
An average person sweats about a litre a day
You may think sweating is embarrassing, but sweat is your body’s way of keeping cool.
Did you know that the average human produces about a litre (quart) of sweat every day, but a person with hyperhidrosis (overactive sweat glands) can sweat up to four times that much a day? Never underestimate the importance of a good antiperspirant!
Your eyes can detect a candle flame from 48 kilometres (30 miles) away
Your eyes are more powerful than you might think. The Earth’s curvature is what keeps a person from seeing for kilometres in the distance. But if the Earth were flat, you’d be able to detect the flame of a candle from 48 kilometres (30 miles) away. That’s like being able to see the flame of a candle from twice the length of the island of Manhattan!
The human eye can distinguish up to 10 million different colours
We’re constantly seeing TVs that boast better picture quality. Screens now display thousands of colours, and yet, it’s nothing compared to how many colours the human eye can actually distinguish, which is estimated to be about 10 million. It’s almost as if your eyes were made up of 63 high-definition cameras.
Thousands of germs live in your belly button
Do you wash your belly button on a regular basis? If your answer is no, you might want to consider scrubbing this cranny more often. Why? Because hundreds of germs live in your navel, that’s why!
After examining 60 belly buttons, researchers at North Carolina State University found 2,368 different bacterial species. It’s hard to believe that many guests can live in such small quarters.
An average person will sleep for 26 years in their lifetime
By the time you hit your 80s, you will have spent approximately 26 years—or the equivalent of one third of your life—sleeping. Even though many people consider sleep to be a waste of time, you need sleep to survive. It’s also when most brain development happens. Simply put, without sleep, you would die!