It will take 1,200,000 mosquitoes all sucking at the same time to drain the average human of blood. Synovial fluid the fluid that eases joint movement is the most slippery substance known to man. When you blush the lining of your stomach blushes too. Nerve impleses travel to and from the brain at around 170mph Humans are the best distance runners in the animal kingdom. There is a thing called persistence running where people run after animals until the animal can no longer keep going. A bite from a human will almost always become infected When a pregnant woman suffers organ damage the fetus sends stem cells to repair the damage Your hands are capable of amazing motor control But your eyesight prevents you from their full potential Human saliva contains opiorphin a protein that is 3 times more effective than morphine There are no muscles in your fingers they're all controlled by tendons. They heart doesn't pump it actually twists itself to circulate blood. There is enough iron in your body to make a nail. Your sense of smell is the last thing to wake up in the morning Roughtly 2kgs of your body weight is bacteria Your eyes see the world upsidedown, but your brain corrects it for you. Everyone has a unique scent. Just like fingerprint unless you have a twin. If you cover your left ear and speak you can hear how you sound to other people Finger tips are actually capable of regrowth If the skull were not fille with fluid the brain would curst itsel under its own weight. The body kills about 19 potential cancer cells every minute. So every minute you almost caught cancer about 19 times.