Biological Brilliance: 31 Eye-Opening Facts About the Human Body

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1Caloric stimulation

Caloric stimulation

If you pour cold water into a person’s ear, their eyes will move in direction of the opposite ear, if you pour warm water into their ear, their eyes will move towards that ear. This is used to test for brain damage and is called ‘caloric stimulation’.

2. The reason why we hate the recorded sound of our voice is that our skull changes the resonance of our voice from within and creates more bass. When we hear a digital recording of our voice, although slightly unfamiliar to ourselves, it’s exactly how other people hear it.

3. Human ears can’t tell where low-frequency sounds come from. Therefore subwoofers can be hidden in home theaters or in trunks of cars.

4. Superior canal dehiscence is a disease that affects the inner ear and amplifies all internal sounds. It gets to the point where the sound of the eyeballs moving in their sockets sounds like “sandpaper on wood.”

5. The lump you feel in your throat when you’re nervous or crying is an autonomic response to stress that expands the glottis in an attempt to provide you with more oxygen.

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6Eyebrows' importance

Eyebrows' importance

The presence of eyebrows is more important for facial recognition than the presence of eyes. Eyebrows may serve as high-contrast lines that give the appearance of the brow greater clarity and emphasis, and their associated musculature allows for sophisticated, often involuntary gestures that may be discerned from a relatively large distance. As such, the eyebrows appear to play an important role in the expression of emotions and in the production of other social signals, and they may also contribute to the sexual dimorphism.

7. People with red hair are more sensitive to thermal pain, are less sensitive to electrically induced pain, and require larger amounts of anesthetics than people without red hair due to a mutation in their melanocortin 1 receptor.

8. Body hair doesn't stop growing at a certain length, it just lives a shorter life and falls out before the hair on your head.

9. Hair texture is caused by follicle shape. Round follicles grow straight hair, flat follicles grow curly hair.

10. Stepping on a strand of hair can potentially allow it to embed itself deep into your skin causing a lot of pain. This is called a hair splinter.

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11Chest hair absence

Chest hair absence

Men who do not have chest hair are deficient in a particular androgen or male hormones.

12. Shaving your pubic hair increases the risk for STD’s because shaving causes many fine cuts in the skin near your genitals, giving more access points for viruses and bacteria to enter your system.

13. Geneticists have figured out the time that evolving humans lost their primate body hair by using mitochondrial DNA to calculate the date that head lice evolution diverged from that of pubic lice. DNA comparisons between the human head louse and pubic louse indicate a common ancestor about 12 million years ago.

14. The more likely a man can grow a beard, the greater the risk he will go bald.

15. Modern biologists have reaffirmed the role of sexual selection in the evolution of beards, concluding that there is evidence that a preponderance of females finds mates with beards more attractive than mates without beards.

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16Strangling vs Choking

Strangling vs Choking

Strangling and choking are not the same things. Strangling cuts off blood flow through the neck while choking cuts off air flow.

17. The reason perfume is applied to necks and wrists, with behind the knees being the most ideal location, is because these are pulse points that will warm the perfume and release fragrance continuously.

18. Your nose is always visible to you. Your brain ignores it through a process called Unconscious Selective Attention.

19. You have holes in your bottom eyelids. The punctum drains excess tears into your nose, which is why your nose runs when you cry.

20. The space extending from your nose to the center of your lips is called the Philtrum. It serves no function in humans but allows other mammals to carry moisture from the mouth to the nose pad to keep it wet which traps odor particles better than a dry nose pad.

21Smelly Farts

Smelly Farts

Farts smell worse in the shower because our nose works better in high heat and humidity.

22. Your nose constantly goes through “nasal cycles” where the 2 nasal cavities alternate being partially congested to enhance your sense of smell and help lighten the workload.

23. Picking your nose and eating it may be beneficial to your immune system.

24. An orgasm can clear up your sinuses. This is because your body gets a rush of adrenaline when you have an orgasm, which causes tissues in the nose to shrink, opening up passageways.

25. Your nose runs when it’s cold because the blood vessels get more blood to keep your nose warm. This causes the blood vessels to dilate and they produce more mucus.

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