Proposed 4-dimensional crystal clock will keep perfect time even after…

Scientists say that a perpetual motion machine is physically impossible, but a research team at the University of California Berkeley has just outlined an idea that comes pretty damn close. By proposing a 4D "space-time crystal," the engineers have designed a device that would operate at its lowest quantum energy… » 9/25/12 6:50am 9/25/12 6:50am