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A User's Guide to Time Travel

1. Scan the galaxy for a loop of cosmic string.
2. When you find one, fly close to it in a massive spaceship. Use the ship's gravity to shape the string into a rectangle roughly 54,000 light-years long and .01 light-years wide...
3. As the two sides approach within 10 feet of each other, circle them in a smaller ship. When you return to the start of the circle, you will have traveled back in time.

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