Paradoxes

If you don't know what a paradox is, here are a few examples:

1. The sentence below is false.

    The sentence above is true.

2. If God is all-powerful, then can he make a boulder so heavy he himself cannot lift it?

3. Pinocchio's nose grows when he lies, so if he says, "my nose will grow now", and it doesn't, then he's lying, but it only grows when he lies. And if it does grow, then he's lying — but he's not.

4. Suppose you time travel to the future and see yourself fall off a building, and then you go back to the present. Can you stop yourself from falling, or are you just fated to do that?

5. In the year 2097 scientists build a time machine. You go back in time to 2037, when your Grandfather was born, and you assassinate him (but who would do that?). By doing that, your Grandfather never married your Grandmother and gave birth to your parents, who didn't give birth to you. So if you were never born, then you couldn't of assassinated your Grandfather, so he did give birth to your parents, who gave birth to you, so you did assassinate your Grandfather...

6. After a while, your ax handle gets worn down. So you replace the handle, but not the head. After some more time, the ax head gets worn down, and you replace it. It's now a different ax because both parts have been replaced. But the question is: when did it become a new ax?

If you want to see more paradoxes, click here.