Human Body
Exploring "Why" questions about Human Body
481 articles
Why do people have different skins tones, face shapes, body shapes etc from different continents?
Indications are that a lot of those features, the key reason Europeans and Asians are different is because of interbreeding with neanderthals and denisovans. The neanderthals and denisovans had lived
Why don’t game AIs use self-learning behavior like they do with robotics simulations?
Genetic algorithms (not Markov chains) are not without their problems, but I think you fundamentally miss the point of game AI here. It's not supposed to be good at it's job. It's supposed to be belie
Why do humans/mammals bleed from the mouth after head/chest trauma? Why is this always the imminent death factor in movies?
Think of what the mouth connects to - your lungs, stomach, and the passageways to your nose and ears. Head/chest trauma can lead to bleeding into one of those areas, which is usually a sign things are
Why does water cause a near perfect hexagon bokeh on camera lenses?
> Basically, how is this caused, and why the hexagon bokeh is always perfectly shaped? Both of those answers are because it is the shape of the lens aperture of the camera. [This link shows what st
Why do certain people faint or feel weak at the sight of blood.
A fear of blood can trigger the vasovagal response, which dramatically lowers blood pressure. No one really knows exactly why that happens, but there's speculation that it might be a way of reducing b
Why do hot showers dry out your skin?
Your skin is kept moisturized by oils in and near the surface. A hot shower can strip these oils. That allows the moisture in your skin to dry out.
Why does your stomach ‘drop’ when your in an elevator?
Because that's literally what happens. Your stomach has inertia, it wants to stay where it is. Your body suddenly starts moving up, it has to exert a force on your insides to get them to also move up.
Why can console games contain and directly portay extremely violent stuff that nobody would do irl, but be very subtle on sexual content which are perfectly legal
Because for whatever reason, western society has become more accepting of depictions of violence than it has of depictions of sex. You see the same thing in films, TV, book, and other entertainment me
Why does citrus taste so bad after brushing my teeth?
You tongue can detect different tastes. It detects salty, sweet, sour, bitter and umami. When you brush your teeth, the toothpaste becomes foamy.
Why does it hurt if I drink through the nose?
We didn't evolve to drink through our noses like for example elephants. We evolved to drink through our mouths. We smell and breath through our nose.