You See, Wire Telegraph Is A Kind Of A Very, Very Long Cat.

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You see, wire telegraph is a kind of a very, very long cat. You pull
his tail in New York and his head is meowing in Los Angeles. Do you
understand this? And radio operates exactly the same way: you send
signals here, they receive them there. The only difference is that
there is no cat.
-- Albert Einstein, when asked to describe radio

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