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Charles Darwin may be dead and gone but a recent write-in campaign has pitted him against Republican
Photograph of the flea that transmits Yersinia pestis to cause bubonic plague, called the oriental r
In 2008, the U.S. economy suffered a gaping wound as several trillion dollars were ripped out of it.
A Gaucher cell showing accumulated fat stored in structures called lysosomes
A lesion called a plaque in the brain of an individual with Alzheimer disease. A ring of degeneratin