Understand German mathematician David Hilbert's infinite grand hotel paradox
Learn about David Hilbert's paradox of the “infinite hotel.”
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Encyclopædia Britannica, Inc.Learn how alpacas (Vicugna pacos) are raised in the Andes Mountains of Peru and Bolivia to be sheared every two years so that the wool can be shipped to cities such as Arequipa, Peru, for processing into fine fabrics.
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Encyclopædia Britannica, Inc.When in doubt, check for a tail.
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Encyclopædia Britannica, Inc.Humpback whales (Megaptera novaeangliae) recorded at sea.
