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For questions about the long-running British science fiction television programme, "Doctor Who", that depicts the adventures of a mysterious and eccentric Time Lord known as the Doctor who travels through time and space in his time machine, the TARDIS.

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How well known was the name "Castrovalva" in Britain in 1982?

Martin Gardner introduced the mathematical art of M. C. Escher to mathematically-minded people in his Scientific American column "Mathematical Games" in 1966. The art book "The World of M. C. Escher" …
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