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Cnidarians have specialized stinging cells called cnidocytes
Endocarditis. The human heart has been sectioned to reveal the left ventricle and origin of the aort
Diphtheria. The bacteria that cause this disease, called Corynebacterium diphtheriae, proliferate in
Photograph of the flea that transmits Yersinia pestis to cause bubonic plague, called the oriental r
In 1839 Mary Cragin, at the age of twenty-nine, became a convert to John Humphrey Noyes’s “communism
Luna Park at Coney Island was a vast living theater in which strollers were both spectators and acto