Harry Hess was a scientist who first theorized key details about the earth's crust that revolutionized the understanding of plate tectonics. Plate tectonics is the separation of the earth's crust along fault lines. More » History Modern History World War 2

President Harry S. Truman's middle initial 'S' is itself his middle name; the initial does not stand for anything. Apparently, Truman's parents were torn over whether to give their son a middle name in tribute to his mat... More » History Modern History US History

Harry Houdini died of peritonitis caused by a ruptured appendix. There is speculation that his death was caused by a McGill University student who punched him in the abdomen to test Houdini's strength. However, this is u... More » History Modern History US History
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Earth is unique in that scientists have found the planet to be the only one to have liquid water on its surface, intelligent life forms living on it, a moon that helps regulate surface temperatures, an atmosphere with 21... More » Science Astronomy Planets

Very slow currents in the relatively plastic lower mantle, or aesthenosphere, are thought to push the crustal plates along and drive the process of plate tectonics. These currents are caused by convection, with the mantl... More » Science Earth Science Plate Tectonics

If plate tectonics stopped, the continents would stay in place rather than moving slowly around the face of the earth. This would also result in a reduction in volcanic activity and earthquakes. Lower volcanic activity c... More » Science Earth Science Plate Tectonics