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Photograph of the flea that transmits Yersinia pestis to cause bubonic plague, called the oriental r
Eighteen-year-olds were the largest age cohort in the first year of the war in both armies. Soldiers
James A. Garfield lies mortally wounded. After failing to locate the bullet, surgeons called in Alex
A thin cleft, called the synapse, separates one cell from another.
A lesion called a plaque in the brain of an individual with Alzheimer disease. A ring of degeneratin