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(PhysOrg.com) -- As every young science student knows, moving objects have kinetic energy. But just how much energy does something need to move? In a new study, a pair of physicists has shown that it’s theoretically possible for a system in its lowest energy state, or ground state, to exhibit periodic motion.

A recent study showed that certain brain areas expand in people who have greater numbers of friends on Facebook . This was welcome news for online social network addicts, particularly teenagers : "Mom, I'm not just on Facebook ; I'm doing my temporal lobe calisthenics." There was a problem, though