21 May 2008 - International Date Line

If you cross the International Date Line going west, you gain a day; it becomes tomorrow. If you cross exactly at midnight, you skip tomorrow and jump ahead to the day after. So a satellite with a precisely-timed orbit could skip a day every day, zooming ahead into the future twice as fast as everything else and putting special relativity to shame.

Who wants to go visit the future? If we go far enough, maybe they’ll have a way to send us back.