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The Infinite Monkey Cage USA Tour: San Francisco

Brian Cox and Robin Ince take to the stage in San Francisco for the last of their USA specials. They talk alien visitations, UFOs and other close encounters with astronomer Dr Seth Shostack, NASA scientist Dr Carolyn Porco, and comedians Greg Proops and Paul Provenza.

Producer: Alexandra Feachem.

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30 minutes

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How many of these GCHQ puzzles can you solve?

How many of these GCHQ puzzles can you solve?

Seven brain teasers set by the government's intelligence agency.

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