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Challenge , chal·lenge / ˈchalənj/ • n. 1. a call to take part in a contest or competition, esp. a duel: he accepted the challenge. ∎ a task or situation that te… Challenger Expedition , The British Navy vessel H.M.S. Challenger circumnavigated the world between December 1872 and May 1876, conducting history's first systematic, scient… Terrorist Use As A Biological Weapon Anthrax , █ BRIAN HOYLE
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