26Tensor tympani muscle
Some people can voluntarily cause a rumbling sound in their ears by tensing the tensor tympani muscle.
27. One of the reasons your lungs feel refreshed when walking through a pine forest is because of an anti-inflammatory compound called a-Pinene, found in conifers. It is used as a bronchodilator in the treatment of asthma and is abundantly present in marijuana.
28. Your heart rate slows when your face touches water. This is called the mammalian diving reflex.
29. Whenever you move your eyes quickly from one point to another point, there is a disconnect between your eyes and brain, so your perception of time stretches backward slightly. This is why, when you first look at a clock, it appears to take longer than a second to move.
30. The 'stomach in your mouth feeling' on a roller-coaster is your organs floating inside you.
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31PDE10A gene
A rare mutation among the Bajau people in Southeast Asia lets them stay underwater longer. Natural selection at the PDE10A gene has increased spleen size in the Bajau, providing them with a larger reservoir of oxygenated red blood cells.
32. We breathe (mostly) out of only one nostril at a time, alternating (on average) every 2.5 hours. This is controlled via turbinates, which are small structures inside the nose that consist of bony projections covered by erectile tissue, filling one side with blood while shunting blood away in the other.
33. Humans hear anywhere from 20 to 100 times faster than they see so that everything that they perceive with their ears is coloring every other perception they have and every conscious thought they have. The sound gets in so fast that it modifies all the other input and sets the stage for it.
34. The average human body has enough iron in it to forge a metal nail that is 3-inches long, enough sulfur to kill all fleas on a dog, enough carbon to make 900 pencils, enough potassium to fire a toy cannon, enough fat to make 7 bars of soap, and enough phosphorous to make 2,200 match heads.
35. The rarest natural hair color in the world is red, with only 1-2% of the world population having naturally red hair. The second is blond, with 3%, then brown/brunette, with 11%, and finally black with 75-85%.
