The best invention: Wheelchair

I think this is the best invention, because...
Despite the fact, that it is hard to transport, for people with kind of disability it is an enormous help in everyday's life. People, who can't walk, or just waiting for rehabilitation, can move without someone else. Moreover, they are able to play games (for example basketball, with wheelchairs), they have more confidence, independence. It can prevent depression or even anxiety.
It is useful in other places. In hospitals, in everydays, in sports. There are different kind of wheelchairs; for different situations. But the ultimate advantage is that everyone can use it. Why? Because there are electronic types of them; if the ,,patient" doesn't have arms, or strong arms enough... or just has one, there is a controller, which is easy to use.

:)