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A physicist and a mathematician are sitting in a
faculty lounge. Suddenly, the coffee machine
catches on fire. The physicist grabs a bucket and
leaps toward the sink, fills the bucket with
water, and puts out the fire.
Another day, and the same two sit in the same
lounge. Again the coffee machine catches on
fire. This time, the mathematician stands up,
gets a bucket, and hands the bucket to the
physicist, thus reducing the problem to a
previously solved one.
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