People who have Autism cannot, or do not (experts aren't really sure), express their emotions. They kind of lock themselves away from everyone. No one knows why, but it happens to people generally when they are very young. It's very sad.

It's difficult to explain autism, mostly because scientists don't really understand it. Probably the best way of thinking of it is to think of someone taking all of their emotions and intelligence and putting that in a bottle and stopping it up. Every once in a blue moon, something escapes, but for the most part everything is locked inside.