If the grandfather paradox blew your mind, these time travel paradoxes will melt your brain. From proving the world's most complicated theorem without actually proving it, to fathering your own self. Here's how to create a pocket watch without really creating it, and why Einstein's theory of relativity might not have been Einstein's brainchild after all. Take a deep breath and press the yellow button!
It was a dark and stormy night. Jack, who had always blamed his grandfather for all the misery in his life, stepped inside the time machine. He pressed some buttons, pulled a lever, and disappeared into the past, his shotgun loaded to kill his grandfather as a little boy ... Press the yellow button, and figure out what happened next!