If you thought you knew everything about yourself, think again. Our bodies are hiding all kind of secrets from us. While it”s usually working hard to be helpful, sometimes things can get a little gross… or even dangerous. I couldn’t believe how much I didn’t know about what was going on in my own body every day!
1. YOUR NOSE CAN REMEMBER 50,000 DIFFERENT SCENTS
Our noses aren’t as talented as a dog’s nose, but they’re still pretty impressive.
We can remember thousands of smells, which is why you’ll never forget the scent of your first love. You produce about 25,000 quarts of saliva in a lifetime. If you were to save all of that spit, it would fill two swimming pools.
2. THE SKIN OF ALL HUMAN BEINGS IS COVERED IN STRIPES. THEY’RE CALLED BLASCHKO’S LINES, AND THEY COVER THE BODY FROM HEAD TO TOE. WE JUST CAN’T SEE THEM.
Our skin is covered in lines of different colours – but they’re usually only visible under UV light.
3. MEN PRODUCE ABOUT 10 MILLION NEW SPERM EVERY DAY.
Do the math: That’s enough to repopulate the entire planet in six months.
4. EXCESSIVE BODY HAIR IS LINKED TO HIGHER IQS.
If you aren’t going to be eating those razor blades, you might as well put them to good use.
5. THERE’S ACTUALLY A BLIND SPOT IN OUR VISION, BUT OUR BRAIN FILLS THE GAP.
The blind spot is a very common phenomenon among vertebrates. It is because the light-detecting photoreceptor cells are absent in the area where the optic nerve passes through the retina. Because of that, the corresponding field of vision becomes invisible as no light is detected from there by our eyes. The phenomenon was first discovered in the 1600s by Edme Mariotte in France. Until then, the point where the optic nerve enters the eye was thought to be the most photosensitive part of the eye.(source)
6. IF YOU DONATE OR DAMAGE A PART OF YOUR LIVER, IT WILL GROW BACK TO ITS FULL SIZE.
The liver is the only internal organ that has regenerative abilities. If the liver is either surgically removed or suffers chemical damage, it can regenerate. It is said that as little as 25% of the liver is enough for it to regenerate itself back to full size, though for donation there are several criteria that has to be met.
7. WE SHED DIFFERENTLY STRUCTURED TEARS DEPENDING ON THE REASON WE’RE CRYING. WHEN PUT UNDER THE MICROSCOPE, TEARS DUE TO GRIEF, HOPE, OR ONIONS ALL SHOW UNIQUE STRUCTURE.
We produce three different types of tears. Basal tears are those produced naturally by any healthy mammal to keep the eyes wet and lubricated. Reflex tears are those produced as a result of irritation due to foreign particles, chemicals, onions, when eating hot or spicy foods, or sudden exposure to light. Crying or weeping tears are those that we shed due to emotional stress, pain or even pleasure, like during uncontrollable laughing.
8. YOUR BODY HAS ENOUGH IRON IN IT TO MAKE A METAL NAIL 3 INCHES LONG.
A human body has enough iron in it to make a metal nail 3 in. (7.5 cm) long. Most of this iron is in the blood.
9. OUR BRAIN FILTERS OUT QUITE A LOT OF SENSORY INFORMATION IT RECEIVES. YOUR NOSE, FOR EXAMPLE, IS SOMETHING YOUR EYES ALWAYS SEE BUT YOUR BRAIN JUST IGNORES IT.
10. IT TAKES AROUND THIRTEEN MILLISECONDS FOR YOUR BRAIN TO PERCEIVE IMAGES AFTER THEY ACTUALLY HAPPEN. SO, YOU ARE BASICALLY ALWAYS LIVING IN THE PAST
10. A tongue print is absolutely unique; remember this when showing it to somebody!
11. A single hair can hold the weight of a hanging apple. However, scientists don’t specify the dimensions of the apple.
12. The number of bacteria in a person’s mouth is equal to the number of people living on Earth, or even more.
13. Nails that are soft and brittle, with no moon, could indicate an overactive thyroid.
14. The speed of an incoming brain impulse is about 400 km/h.
15. There are not just four different blood types as we used to think, but in fact 29! The rarest of them belongs to the Bombay subtype, which is common for a small group of families in Japan.
16. Over the course of just one day, our blood ’runs’ the distance of 19,312 kilometers.
17. The total length of all the nerves in the human body is 75 kilometers.
18. A human makes approximately 20,000 breaths per day.
19. Almost all people in the world have special mites on their eyelashes called demodex.
20. A human eye can distinguish up to 10 million different colors. But our brain can’t remember all of them.
21. Our ears keep on growing throughout our lives with almost unbelievable speed — a quarter of a millimeter per year!
22. The heart beats 35 million times a year. Yes, 35 million. A year!
23. Every day, the human body loses about one million skin cells — that amounts to 2 kilos every year.
24. 1 square centimeter of your skin contains around a hundred pain sensors.
25. Boys have fewer taste buds on the surface of their tongues than girls do.
26. The average person consumes about 35 tons of food during his or her life.