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He who never made a mistake, never made a discovery.
Samuel Smiles
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This entry relates to the physical concept of speed; for the film, see Speed (1994 film)

Speed is the rate of motion, or equivalently the rate of change in position, often expressed as distance d traveled per unit of time t.


  • Be wise with speed;
    A fool at forty is a fool indeed.
  • Ease and speed in doing a thing do not give the work lasting solidity or exactness of beauty.

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