Is the Universe a 2D hologram?

For all we know, the three dimensional world we see around us is really an illusion — one that's actually in 2D. It's a slightly unsettling idea, but it's also one that physicists have been thinking about for some time. Unfortunately, until recently, a 2D universe wasn't something we could verify. Now, thanks to an… » 8/26/14 10:07pm Yesterday 10:07pm