Boys and girls, how many of you like to wear caps? Some people do and some people don't. I read somewhere that if your feet are cold, you should put something on your head. That didn't make sense to me until someone explained that your body works extra hard to keep your brain warm. It will even let your feet freeze in order to keep your brain warm. That is why a cap is so important on a cold day.

But why does the body work so hard to keep the brain warm? Your brain is the most important part of your body, is…