What's your favorite paradox?

Question: What's your favorite paradox!?

(anything that is true while being self-contradictory, bearing properties opposite to one another)Www@QuestionHome@Com

Best Answer - Chosen by Asker:

The grandfather paradox, concerning time travel, in which if a man travels back in time to kill his grandfather, so that his father will not have been born, and he would not have been born, how could the man have traveled back in time to kill his grandfather in the first place!?Www@QuestionHome@Com

Schr?dinger's cat

He proposed a scenario with a cat in a sealed box, where the cat's life or death was dependent on the state of a subatomic particle!. According to Schr?dinger, the Copenhagen interpretation implies that the cat remains both alive and dead until the box is opened!.Www@QuestionHome@Com

Zenos' paradox!Www@QuestionHome@Com

The Twin Paradox!.Www@QuestionHome@Com

jumbo- shrimpWww@QuestionHome@Com