How we perceive time has much to do with our ability ~ or inability, as the case may be ~ to perceive parallel universes. And the key to whole mystery might be time travel, according to Andrew Cleland and other quantum physicists at the University of California.
According to Fox News:
What does it all mean? Let's say you're in Oklahoma visiting your aunt. But in another universe, where your atomic particles just can't keep up, you're actually at home watching "The Simpsons." That may sound far-fetched, but it's based on real science.
"When you observe something in one state, one theory is it split the universe into two parts," Cleland told FoxNews.com, trying to explain how there can be multiple universes and we can see only one of them.
The multi-verse theory says the entire universe "freezes" during observation, and we see only one reality. You see a soccer ball flying through the air, but maybe in a second universe the ball has dropped already. Or you were looking the other way. Or they don't even play soccer over there.
Sean Carroll, a physicist at the California Institute of Technology and a popular author, accepts the scientific basis for the multi-verse ~ even if it cannot be proven. "Unless you can imagine some super-advanced alien civilization that has figured this out, we aren't affected by the possible existence of other universes," Carroll told Fox News. But he does think "someone could devise a machine that lets one universe communicate with another."