Anyone brave enough to travel around the cylinder would be swept along, attaining fantastic speeds. In fact, to a distant observer, it would appear that the individual was exceeding the speed of light. Although Van Stockum himself did not realize it at the time, by making a complete trip around the cylinder, you could actually go back in time, returning before you left. If you left at noon, then by the time you returned to your starting point, say, it might be 6 p.m. the previous night. The faster the cylinder spun, the further back in time you would go (the only limitation being that you
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