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Articles about things considered unusual may be accepted in Wikipedia if they ..... Interesting number paradox, Either all natural numbers are interesting

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The second is the base unit of time in the International System of Units and is also a unit of time in other systems of measurement;

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Birds are feathered, winged, two-legged, warm-blooded, egg-laying vertebrates. Aves ranks as the tetrapod class with the most living species, approximately ten thousand