The Grandfather Paradox: A Guide to Not Messing Up the Timeline

Warning: Time Travel is Hard, Don't Do It

So, you've got a time machine. Congratulations! Now you can go back in time and fix all the mistakes you made in high school. Or not.

But wait, there's a catch. If you go back in time and kill your grandfather before he has kids, then... well, that's just mean.

• Predestination: The Other Kind of Time Travel
• Time Paradox Taxi: Get to Your Destination Safely
• Time Traveler Support Group: Because You'll Need It
• Time Hopping Guidelines: Because Who Needs Rules, Anyway?

Don't say we didn't warn you.

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