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When giving the coordinates for a location, most people provide the latitude, longitude and perhaps altitude. But there is a fourth dimension often neglected: time. The combination of the physical coordinates with the temporal element creates a concept known as space-time, a background for all events in the universe.

"In physics, space-time is the mathematical model that combines space and time into a single interwoven continuum throughout the universe," Eric Davis, a physicist who works at the Institute for Advanced Studies at Austin and with the Tau Zero Foundation, told by email. Davis specializes in faster-than-light space-time and anti-gravity physics, both of which use Albert Einstein's general relativity theory field equations and quantum field theory, as well as quantum optics, to conduct lab experiments.

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