Lists and Curiosities

Curiosities about the human body you probably didn’t know

I would like to invite you to reflect on how we are such complex beings. Let's learn a little more about our bodies.


From a young age, we learn the basics about our bodies, what each limb is for, and how to use our senses. But there are other features of our body that we probably already realize but never delve into to find out what they really are.

There are a lot of really curious facts for you to learn before your child asks you and leaves you wondering and in doubt.

There are so many facts that we will shorten the introduction to start surprising you.

The best-paid athletes of 2022

Thirty-two years ago, the highest-paid athlete was Mike Tyson. Today, who do you think is the best-paid athlete?

Here’s the list.

Curiosities about the human body you probably didn’t know:                               

  1. Our brains tend to work more when we are asleep.
  2. Look at your belly button: this very small part of your body has on average 67 different species of bacteria.
  3. Over the course of a year, we lose approximately 4 kg of dead skin cells.
  4. Before one-month-old babies have no tears, despite the fact that they cry a lot.
  5. The human brain triples in size in the first year of a baby’s life.
  6. Our body produces about 25 million new cells per second.
  7. Blood makes up about 8% of your body weight.
  8. The left lung is about 10% smaller than the right lung.
  9. Our nose can recognize about a trillion different smells.
  10. Human teeth are as strong as shark teeth.
  11. Its body produces soft rays of light, but unfortunately, they are invisible to the naked eye.
  12. During his lifetime, a single person produces enough saliva to fill two Olympic-sized swimming pools.
  13. Without the little finger, you would lose about 50% of the strength of your hand.
  14. The gastric juice in your stomach is so acidic that it can dissolve even metal.
  15. Just like fingerprints, the tongue print is also unique for each individual.
  16. If we were to place in a straight and stretched line all the blood vessels of an adult, we would see that the length would be enough to circle the earth around the equator four times.
  17. The liver is the only organ that can completely regenerate itself. If someone were to donate a part of his liver to another person, his liver would return to its original size in a few weeks.
  18. We are about 1 cm taller in the morning than when we go to bed. This is because during the day the cartilage between the bones is crushed and compressed.
  19. The only muscle that never gets tired is the heart.
  20. If you are 70 years old, your heart has beaten about 2.5 billion times.
  21. Eyes blink about 20 times a minute. That’s more than ten million times a year.
  22. Babies are born with about 300 bones, but as they grow, some of those bones fuse together. When they reach adulthood, they have only 206 bones.
  23. More than half of your bones are located in your hands, wrists, feet, and ankles.
  24. Although teeth are considered part of the skeletal system, they are not counted as bones.
  25. Despite representing 2% of our body mass, the brain uses 20% of our oxygen and blood supply.

Did you already know some of these curiosities?

Many of these curiosities will not change your life in any way. But I would like to invite you to reflect on how we are such complex beings with perfect architecture.

On day number 1 of our existence, we were a being formed by the meeting of two cells. And look, with a list of 25 items we could realize how little we know about ourselves.

About the author  /  Marcelo Lopes


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