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175 YEARS AGO: To the Source!
Explorer and ethnologist Henry Schoolcraft leads a search for the headwaters of the Mississippi in July 1832, and finds them in a Minnesota lake he dubs Itasca, a contraction of veritas and caput (true head). Though history credits Schoolcraft with "discovering" the river's source, he has help: local Ojibwa Indians give him detailed directions. His later writings on Native culture are a source for Longfellow's "Song of Hiawatha." Schoolcraft dies in 1864.
320 YEARS AGO: Apple of His Eye
"Nature does nothing in vain," writes English physicist Isaac Newton in his masterwork Philosophiae Naturalis Principia Mathematica
(Mathematical Principles of Natural Philosophy), published July 1687. His explanations of nature's behavior, the laws of motion and universal gravitation, are the basis for the subsequent science of mechanics. Newton is knighted in 1705 and dies in 1727, age 84.


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