When we get sunburn, that's not the heat of the sun that's hurting us most of the time, but it's little skin cells killing themselves to protect us from skin cancer. Not so cool if I think about it.

You can see your nose all the time, your brain just chooses to ignore it.

Lactose intolerance is a normal gene. Being able to drink milk is a mutation.

When were in an unfamiliar environment we sleep with half our brain at a time kinda like sharks and that's why we wake up easier.

Archaeologist here. You can give birth after you've died. Occasionally we will come across a really confronting burial where the skeleton of an unborn child is halfway through its mothers pelvis. Generally what happens is the woman has died before giving birth and after burial a build up of gasses from decomposition forces the baby out. We refer to this as "coffin birth".

When you are exhausted and go to bed your body shuts down faster than usual. That 'jerk' or 'kick' that your leg makes is a signal from the brain to make sure you are not dying. Your body takes a a while to slow down to sleep but whilst exhausted your brain double checks to make sure you are still alive by sending a message from your brain to to the bottom of your body to check if your nerve sytem is still functional. This is usually a quick kick of your predominant leg.

Your heart rate increases about a minute before partaking in exercise. It is known as the anticipatory rise and happens involuntarily.

Breastmilk will produce antibodies to help baby fight off disease. It’s thought that’s babies saliva enters the nipple, mums body tests for any undesirable bacteria, then produces milk to help fight it off. For this reason, it’s not unusual for breastmilk to look different when baby is sick. Sometimes very dark yellow and thick, almost like colostrum. It also contains different hormones depending on the time of day, and is antibacterial. It is a living liquid

You mostly breathe out of one nostril at a time, and the ‘dominant’ nostril switches every hour or so.

The human body contains enough fat to make seven bars of soap.

We have an internal regulator that prevents us from using our full strengh. Or muscles usually only work at about 60% max of what we are capable off. In extreme life and death situations these regulators stop and we are able to use our full strength. This is how the parts where people tipped over cars and similar come from. These regulators are because at full strength we heavily damage our bodies. Essentially, you could lift something to the point where it is either lifted or your arm just breaks instead. I believe there has also been someone who ran so hard his leg broke.

Women are actually programmed to forget the pain of child birth after a few months or so. If this didn’t happen, most women would only end up having one child, which would eventually lower the population.

You just need to focus on the time you want to wake up and our hypothalamus would wake us up at the exact same time.

Amniotic fluid is mostly baby urine.

The microscopic mites living on your face feeding off the oil glands. You can't see them, but they're there. They are microscopic mites, eight-legged creatures rather like spiders. Almost every human being has them. They spend their entire lives on our faces, where they eat, mate and finally die. There are two species of mite that live on your face: Demodex folliculorum and D. brevis. It's cool cause that means I'll always have some friends with me.

You're taller in the morning than the rest of the day/night.

There is a muscle, called palmaris longus, in the forearm missing in about 10% of the population. You can easy test if you have it by putting your pinky and thumb together, while holding your palm facing up, and flex the hand upwards. If 1 tendon is standing out more than the others that's palmaris longus.

Some humans do not feel any pain and have to be closely monitored because they can get sick/injured so easily and not even realize.

We have a bunch of microplastics in our body.

Eye immune privilege: Your immune system doesn't know your eyes exist. There's a chance that if you get an eye injury or an infection near your eyes the immune system will think your eyes are a foreign body and you'll go blind.

Cutting the corpus callosum ( connects two brain hemispheres) can produce some freaky results. Such as your hand doing s**t that your conscious mind isn't aware of, writing a sentence or scratching an itch without knowing for instance.

The femur is stronger than steel and concrete.

We are, by cell numbers, more bacteria than human.

The war that's constantly happening inside of you. Everyone knows about your immune system but the sheer complexity of it is amazing. Like, your body has neutrophils which are like the generic white blood cell that constantly goes around your blood vessels seeking out foreign objects, but did you know there are cells called macrophages which are like way better neutrophils in the fact that neutrophils mostly swallow bacteria to kill them, macrophages do this too except they can swallow close to 100. You have stuff like dendritic cells whose main goal is to be an early warning system, they swallow an invader then carry a piece of it back to T cells to activate them. Once they're activated, T cells swarm that specific invader and kill anything that has that antigen. I didn't even name close to all of the cells that are doing constant battle inside of you 24/7 365 days a year. So next time you have the flu or an infection, think of the little guys inside you who gladly fight the good fight

There is actually gold in your blood, but only about 0,04 milligrams per person

You have enough potassium in your body to create a very small bomb.

Some people will cough if they put something in one ear, a very small percentage will cough if something is in either ear. It is called Arnold’s ear-cough reflex.

Some Asian people (like Japanese or Korean) do not emit body odor from their armpits and do not need deodorant. These same people do not have sticky earwax. How can you tell if you’re a non stinky armpit Asian? If you have gooey sticky earwax, keep using deodorant. If your earwax is dry and crumbly, stop using deodorant for a week and have a trusted friend or partner give ya a sniff test after moderate exercise or at the end of the day. you probably are wasting money on deodorant.

Some people can control tensor tympani to chage sounds in their ears

99.9999999% of your body is empty space. ... If we lost all the dead space inside our atoms, we would each be able to fit into a particle of dust, and the entire human species would fit into the volume of a sugar cube.