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" ... We are all familiar with massive objects being influenced by gravity. For instance, think of a planet orbiting the sun. As the planet moves, a centripetal force acts on it, which curves the motion. Without gravity, the planet would travel in a straight line. General relativity puts a different perspective on the situation. Instead of describing the object as moving along a curve in a flat spacetime, the object is described as moving along special “lines” in a curved spacetime. The curves are a consequence of gravitation. The spacetime curves are called geodesics, and they generalize the notion of straight lines to curved spacetime. ... "
" ... “American magazines sustained both a centripetal movement toward a common center and a centrifugal movement toward many distinct, often intersecting, sometimes opposing communities,” observes UC Berkeley sociologist Heather A. Haveman in the introduction to the exhibition catalogue. Haveman’s essay focuses on the early years of American magazines, but Lomazow’s collection shows that her point is applicable to any period. ... "