The BBC's website is one of the most valuable resource on the web, to my mind.
The reason I mention this today is, I noticed two time travel-related news items:
1. The "kill your own father" time travel paradox appears not to be possible, per the findings of a new model of time travel based on quantum mechanics. There's not much along the lines of an out-and-out proof of the conclusion, but they work backwards through the Infinite Alternate Realities theory to conclude somewhat convincingly that, no matter how motivated you may be, you wouldn't possibly manage to travel back and kill your own father.
2. Wormholes ruled unlikely as a method of time travel. This one is more rigorous, and they have basically calculated that the complexity of making a stable wormhole big enough to allow a proton through, never mind one large enough to allow a person through, is likely beyond the foreseeable means of human technology. Bah! So much for the best great hope for timetravel from my adolescence.
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