Oops, I didn't intent to obscure my meaning. I was replying mainly to mbq: https://news.ycombinator.com/item?id=7602812 https://news.ycombinator.com/item?id=76

Oops, I didn't intent to obscure my meaning. I was replying mainly to mbq: https://news.ycombinator.com/item?id=7602812 https://news.ycombinator.com/item?id=7602812 My understanding is, with QM, is is even harder or even impossible to reverse time, even with perfect knowledge of your reachable surroundings. In a classical universe however, it looks much easier, so in such a universe, the explanation for time is less satisfactory.