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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.

In the 19th century, artists including Degas, Monet, and Renoir got together periodically to discuss their commissions, their patrons, and their industry. This circle met consistently, and the artists credited these small gatherings with not only making their careers but the rise of the impressionist movement.