01 JAN 2012 by ideonexus

 A Clock Stopped at the Moment Feynman's Wife Died

Sometimes we can actually pin down the explanation of a weird coincidence. A great American scientist called Richard Feynman tragically lost his wife to cancer, and the clock in her room stopped at precisely the moment she died. Goose-pimples! But Dr Feynman was not a great scientist for nothing. He worked out the true explanation. The clock was faulty. If you picked it up and tilted it, it tended to stop. When Mrs Feynman died, the nurse needed to record tl the time for the official death ce...
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But he traced the phenomenon to a faulty mechanism in the clock that triggered when the nurse picked it up to record the time of death.

12 DEC 2011 by ideonexus

 QED Explained

Feynman's graphical method provides a way of visualizing each term in the sum over histories. Those pictures, called Feynman diagrams, are one of the most important tools of modern physics. In QED the sum over all possible histories can be represented as a sum over Feynman diagrams like those below, which represent some of the ways it is possible for two electrons to scatter off each other through the electromagnetic force. In these diagrams the solid lines represent the electrons and the wav...
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A good description of the Feynman Diagrams from QED and how the infinite possibilities must be accounted for in mathematics dealing with them.