1Nose hair
If you pluck a nose hair, only the eye on the same side will tear up.
2. Federico da Montefeltro, fifteenth-century duke of Urbino, after having lost one eye in a tournament had his surgeons successfully amputate the bridge of his nose to widen his field of view.
3. 20% of the genetic material in a typical human nasal swab is a biological dark matter that cannot be attributed to any of the existing categories of living organisms on Earth (bacteria, archaea, and eukaryotes).
4. Bloodhounds get 10 times more neuronal information from their nose than humans get from their eyes.
5. 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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6Sinus Clearance
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.
7. Picking your nose and eating it may be beneficial to your immune system.
8. 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.
9. Farts smell worse in the shower because our nose works better in high heat and humidity.
10. 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.
11Emotional nose
You have holes in your bottom eyelids. The punctum drains excess tears into your nose, which is why your nose runs when you cry.
12. Your nose is always visible to you. Your brain ignores it through a process called Unconscious Selective Attention.
13. 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.
14. Strangling and choking are not the same things. Strangling cuts off blood flow through the neck while choking cuts off air flow.
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.
16Balding probability
The more likely a man can grow a beard, the greater the risk he will go bald.
17. 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.
18. 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.
19. Men who do not have chest hair are deficient in a particular androgen or male hormones.
20. 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.
21Hair texture
Hair texture is caused by follicle shape. Round follicles grow straight hair, flat follicles grow curly hair.
22. 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.
23. 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.
24. 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.
25. 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.
