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Charles Darwin may be dead and gone but a recent write-in campaign has pitted him against Republican
Cardiac catheterization. Insertion of a tube called a catheter through a blood vessel. In this examp
Photograph of the flea that transmits Yersinia pestis to cause bubonic plague, called the oriental r
Earth’s history is divided into nested sets of time--eons, eras, periods, and epochs--and is called
In 2008, the U.S. economy suffered a gaping wound as several trillion dollars were ripped out of it.
A lesion called a plaque in the brain of an individual with Alzheimer disease. A ring of degeneratin