Pretty a fascinating blog on time travel – hard to believe so much research went into this.

Time travel is a subject of great interest to me – not the actual, you know, nuts and bolts physics of it, but the various possible models that can be imagined. I’ve written a variety of fiction based around these. The most important thing, I find, when coming up with a new theory, is to try to trip it up in every way imaginable and make sure it still works.

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