Physics

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Is time real or an illusion?

Diverse thinkers, from the ancient Greek philosophers through contemporary quantum cosmology and eternal inflation theory, have called time an illusion. Are they right?

Introducing the world's first solar-powered battery

A battery that runs on sunshine and fresh air sounds like something from a utopian novel, along with fusion-powered hover cars and cancer-curing breakfast cereals. But that is exactly what scientists at The Ohio State University have just invented: a solar cell that stores its own power.