An experiment that might let us control events millions of years ago

Most of us have heard of the famous double-slit experiment. Usually it's played out in a lab in seconds. But there's one version, dreamt up by physicist John Archibald Wheeler, that can be played out over much of the galaxy, over millions of years. His thought experiment suggests that we could retroactively… » 2/19/14 12:04pm 2/19/14 12:04pm