Some important inventions of the last hundred years

What do you think are the most important inventions of the last hundred years? Seth Godin mentions a few, and why they are important:

Air conditioning--which made it possible to do productive work in any climate

Credit cards--which enabled transactions to take place at a distance

Television--which homogenized 150 world cultures into just a few

Federal Express and container ships--which made the transport of physical goods both dependable and insanely cheap

The internet--which moved information from one end of the world to the other as easily as across the room

Cell phones--which cut the wires.

How have these inventions affected you?