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The Nature of Reality

Do Time Travelers Tweet?

26 Mar 2014, 18:25 UTC
Do Time Travelers Tweet? Curious Expeditions/Flickr, under a Creative Commons license.
(200 words excerpt, click title or image to see full post)

We live in four dimensions: three spatial dimensions plus a fourth dimension, time. Of these, time is the most fluid, the one that is most influenced by personal experience. It goes too fast, or not fast enough. Time gets to the very heart of what it means to be human since our experiences, which take place in time, are what shape our lives and decisions in the present and the future. And yet it is the only dimension in which we are restricted to moving in only one direction: forward.
Or are we? And if we can move backward in time, how would we prove it?

Augustinian Friar's Astrological Clock at the Clock Museum in Vienna. Credit: Curious Expeditions/Flickr, under a Creative Commons license.
These are the kinds of questions my research group and I were discussing one day over pizza and poker. Time travel: Literature and movies are full of references to it. The stories may be fictional, but much about the nature of time is still unknown, and science thrives in these gaps in knowledge: as we try to fill the gaps, we discover how many more there are. Yet for as long as scientists and philosophers have ...

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