Why does hair go gray?
The simple answer here is because people get old. Not an answer that satisfies your average child though! It is all to do with pigment and cells. The hair is like a tube that is full of both and in-between are spaces. In young people this space is filled with a fluid and this has the job of keeping the cells and the pigments in their place. That means that young people keep their hair color really well because, let’s face it, they are full to brimming with fluids of one kind or another. As we get older we don’t produce as many – ahem – fluids and the space between the cells and the pigment is filled with air instead. This means that the pigment is gradually lost and the process of graying reflects that.
Why do your hands go wrinkly in the bath?
Why do we blush?
What is the funny bone?
When you stick people in the ribs with your elbow, they might tell you that your bones are very sharp! That is because the ulna sticks out. So, the ulnar nerve, being so close to the surface, is easy to bump. When the ulnar nerve is knocked it can be quite painful and pain can often cause people to laugh just as much as cry. This is why it is called the funny bone.
Why do men have nipples?
Why is urine yellow?
Urea comes from the ammonia and the bilirubin is converted to something called urobilogens. Salt, urea and water have no color. But! Urobilogens are yellow! So if you have had a lot of water to drink your urine will appear lighter. If you haven’t had much water to drink then your urine will appear yellow, getting darker and darker the more dehydrated you are. If this is too much information to take in, tell the kid it depends on the amount of bananas we eat.
How fast is the fastest runner?
Do your ears grow all your life?
First Image Credit - Flickr User Trippography
Post this article on your wall