Who invented the knock knock joke?

Two wee chaps

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How did Al Gore invent the Internet?

With Al-Gore-rithims

Which scientist invented the nuclear powered floor cleaner?

J. Robert Moppenheimer

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Why aren't there any knock-knock jokes about America?

Because freedom rings.

Why aren't there any 'Knock, Knock' jokes about America?

Cuz freedom rings, baby!