You've got your time machine, now you've got your problems. The Grandfather Paradox is just the tip of the iceberg when it comes to the dangers of time travel.
Here's a few tips to help you avoid creating a paradoxical mess:
And for the love of all that is sane, don't try to prevent the invention of the microwave.
Learn more about the perils of pre-destination.
Or, if you're feeling bold, try your hand at: