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  letter Reflections on a Revolution

  In response to “The Yang–Mills Model”

  [short_description] Gauge theories brought about a profound revolution in the way physicists think about the fundamental forces. It is this revolution that is the subject of Sheldon Lee Glashow’s essay.

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  letter A Remarkable Connection

  In response to “A View from the Bridge”

  [short_description] The bridge between mathematics and physics was a one-way street, with physicists using mathematical results to solve physics problems. Then string theory opened the bridge to two-way communication.

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  letter On Atoms and Empty Space

  In response to “Threads in the Tapestry of Physics”

  [short_description] Physics has ancient beginnings in the Greek period, in the work of Democritus of Abdera, father of atomic theory, and Euclid from Alexandria, generator of the first axiomatic system ever conceived.

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