Quantum Paradoxes and Contradictions

Where the laws of physics are bent, broken, and occasionally laughed at.

Featured Paradoxes:

A barber who is also a customer walks into his own shop, and is he or is he not a member of the barber's clientele?

What if a time traveler goes back in time and kills their own grandfather before he has children?

Two twins, one in motion, one at rest, which one is older, and why does it matter?

A sub-barber, a sub-customer, and a sub-shop, where do we draw the line?

A time traveler's time machine breaks down, and they're stuck in a paradox loop.