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Lithotripsy. The direction of a sound pulse crushes the stones into smaller fragments that can be pa
Blocked at every turn by congressional Republicans who hated him, President Obama turned to techniqu
Emanuel Leutze’s Washington Crossing the Delaware (1851) is riddled with historical inaccuracies, mo
In the summer of 1793, a yellow fever epidemic struck Philadelphia, killing nearly 4,000. Tens of th
Escape Itineraries of Some Prominent Fugitive Slaves
The study of how traits such as flower color are passed from generation to generation provided the m