You're in luck! Dr. Novikov has graced us with their presence, ready to explain the intricacies of Time Travel and the Novikov Self-Consistency Principle. Don't worry, we're sure you're not going to ask something too obvious, like "Why is the sky blue?" or "Is the answer to the ultimate question really 42?"
Dr. Novikov's groundbreaking principle states that a time traveler cannot create a closed timelike curve, which would allow them to travel back in time and kill their own grandfather. That's just not allowed. The universe is all, "Hey, no you can't do that! You're not going to mess with causality like that!"
But, what about the paradoxes? Won't a closed timelike curve just create a big ol' mess? Fear not, dear traveler! The Novikov Self-Consistency Principle has got you covered. It's like a cosmic "do-over" button, ensuring that any attempts to create a paradox will simply... unhappen.
Side note: Dr. Novikov has a PhD in Physics from the University of No-Brainer. His dissertation, "Theoretical Physics for Dummies" is a real page-turner.