"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."
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The wireless telegraph is not difficult to understand. The ordinary telegraph is like a very long cat. You pull the tail in New York, and it meows in Los Angeles. The wireless is the same, only without the cat. — Variant, earliest known published version is How to Think Like Einstein by Scott Thorpe (2000), p. 61. Appeared on the internet before that, as in this archived page from 12 October 1999
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Albert Einstein
1879 – 1955
deutsch-schweizerischer Physiker und Nobelpreisträger
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