What is the singular most important invention of the twentieth century?

Question: What is the singular most important invention of the twentieth century!?
Best Answer - Chosen by Asker:

alternative current by Nikola Tesla!.If he hadn't invented alternative current there wouldn't be TV,computers,internet!.!.!.!.Www@QuestionHome@Com

Television!? It helps us to become dumber!.
P!.D!.: People are not watching "History Channel", "Discovery Channel" and "PBS"!. But such idiotic tv shows like "Leave to Beaver", "Andy Griffith" or "Beverly Hills whatever the damn number"!. You know is true!.Www@QuestionHome@Com

The computer, no contest!.Www@QuestionHome@Com

the computerWww@QuestionHome@Com

the internetWww@QuestionHome@Com

Wouldn't it be the pirnting press!.!.!.!.Www@QuestionHome@Com

computers just made people lazy, i think it was the gun!.Www@QuestionHome@Com

the home computerWww@QuestionHome@Com

Home Computers and the Internet!.!.it has made people more globally aware!.Www@QuestionHome@Com