Quantum geometry describes quantum states in systems with changing system parameters, such as an electron spinning in a magnetic field whose direction is slowly changing. The state of the electron ...

For decades, residents of Tucson, Phoenix and much of Arizona have benefited from plentiful and relatively cheap power from coal-burning power plants on Navajo tribal lands in Arizona and New Mexico.

Renewable energy is energy derived from natural sources that are replenished at a higher rate than they are consumed. Sunlight and wind, for example, are such sources that are constantly being ...