This summer's Scientific American has an article about building time machines in it! Time travel buffs probably already know about this. I'm feeling a bit gypped though, because normally I don't buy magazines and they published the exact same magazine in 2012....

I tend to agree with Larry Niven's "If the universe of discourse permits the possibility of time travel and of changing the past, then no time machine will be invented in that universe."

Makes total sense to me! I don't expect we'll get to experience time travel... not in this universe anyway.