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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.

Although there were some raised eyebrows, when Bulgari absorbed the Gerald Genta and Daniel Roth brands, watches like the Endurer Chronosprint All Blacks ($16,300) underscore how much energy the Italian jeweler has injected into the designs of the two former boutique watchmakers. Enthusiasts will quickly identify the signature case of ...

The sun strikes every square meter of our planet with more than 1,360 watts of power. Half of that energy is absorbed by the atmosphere or reflected back into space.