Consider the unfortunate death of George Washington. In December 1799, not long after he had retired as America’s first president, Washington spent a long day on horseback in foul weather inspecting Mount Vernon, his plantation in Virginia. Returning home later than expected, he sat through dinner in damp clothes. That night he developed a sore throat. Soon he had difficulty swallowing and his breathing had become laboured. Three physicians were called in. After a hurried consultation, they opened a vein in his arm and drained eighteen ounces of blood, almost enough to fill a pint glass.
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