In 1991 it was discovered that the heart has its “little brain” or “intrinsic cardiac nervous system.” This “heart brain” is composed of approximately 40,000 neurons that are alike neurons in the brain, meaning that the heart has its own nervous system.
Feeling sick is part of the body’s attempts to preserve energy for the immune system and make you act in a way that signals to nearby people that you need help
Dean Karnazescan can run without ever getting tired due to his exponentially high lactate threshold. He was able to run a Marathon in the south pole at -25C and run for three consecutive nights before having to stop for sleep.
The Sama-Bajau, a sea-faring and nomadic people, have physical adaptations that enable them to see better and dive longer underwater. It was recently discovered that they have evolved bigger spleens that provides a larger reservoir of oxygenated red blood cells.
If you were to instantly vanish, there would be a shell of microscopic creatures left behind.
Some people can “flex” muscles in their inner ears to produce a low rumbling sound.
You can change your testosterone and cortisol levels by changing body language and acting more alpha.
When in love, the human brain consistently releases the same combination of neurotransmitters and hormones that is released by amphetamines, leading to side effects such as increased heart rate, loss of appetite and sleep, and an intense feeling of excitement.
For those who have trouble sleeping researchers say that 1 week of camping, without electronics, resets our biological body clock and synchronizes our melatonin hormones with sunrise and sunset.
The same parasympathetic system that commands your colon to go to the bathroom, is also the same system that controls your tears. Sometimes, these signals get crossed which is why some people shed tears when they poop.