Word: electromagneticism
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Who would place a $90 million, high-powered radar station so close to an airport that it has to be shut down every time a plane lands? Someone, it turns out, who should know better: the U.S. Air Force Space Command. The problem exists at Robins Air Force Base in...
So there I was, sitting at the keyboard of an IBM PC AT, my eyes glued to the screen. Game or not, my pulse raced and my hands sweat as the MiG-25 came threateningly closer. Finally it peeled off toward Tripoli, its Soviet- trained pilot seemingly unaware of my...
The method of propulsion is basically similar in the two systems. In both cases the train effectively rides on an electromagnetic wave. Alternating the current in a set of magnets in the guideway changes their polarity and thus the way they interact with the magnets on the train. As a...
Describing the core of the earth is no mere academic exercise. Understanding earthquakes, volcanoes and other geological phenomena depends largely on fathoming the forces at work within the planet's mantle, the thick layer of rock that stretches from the core to within an average of 30 miles of the...
That scenario could illuminate more than just the confusing differences in the velocity of pressure waves; it could also help explain the mystery of the origin of the earth's magnetic field, as well as its unexplained reversals. About once every million years, magnetic north and south inexplicably exchange places...