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Photograph of a child with a cochlear implant. This device sends electrical impulses directly to the
Pulse oximetry with the sensor probe applied securely, flush with skin, making sure that both sensor
In 2013, Americans learned that the federal government massively surveys their phone calls and e-mai
In 2009, historian Woody Holton described how Abigail Adams shrewdly invested in the Continental Con
This engraving by William Russell Birch shows Congress Hall (left), which was occupied by Congress f
In the summer of 1793, a yellow fever epidemic struck Philadelphia, killing nearly 4,000. Tens of th