Known by many names like The Grandfather Paradox, The Time Travel Paradox, or The Bootstrap Paradox, the hardest riddle in the world takes the form of a hypothetical scenario with paradoxical consequences: A time traveler goes back in time and kills their own grandfather before they are born. This creates a paradox: if the time traveler never existed, how could they have traveled back in time to kill their grandfather?
This riddle challenges our understanding of causality and the nature of time. It has no clear solution and has been debated by philosophers, scientists, and science fiction writers for decades. Some argue that the time traveler would create an alternate timeline, while others believe that the paradox would prevent the time traveler from ever existing in the first place.
