Medecine
Why do we cry?
Tears are made by glands that are above the eyelid. They are called the lacrimal glands […]
Why ?
Medecine
Why do we hear? How it works ?
To understand how we hear, we must know that sounds are movements of the air. When we speak or when we play music, we create vibrations in the air. […]
Medecine
Why are eyes dirty when you wake up?
It is important that our eyes stay constantly wet to be protected. So the tear glands make tears all the time. When you sleep, your glands continue to produce tears. […]
Medecine
Why don’t lice just die drowning when you wash your hair?
Lice breathe through small holes that they can close on command. […]
Body
Why do some people have curly hair?
The follicles in which hair grows can have different shapes […]
Medecine
Why are there reds, blondes or other hair colors?
Hair color depends on a molecule called melanin. Melanin is a dark brown pigment. […]