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TIL the Hoover Dam was made with enough concrete to build a highway from New York to California

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a8E1L TIL that philanthropist and engineer Avery Fisher was motivated to start his own company after, identifying a way to save his employer $10,000 a year, was immediately denied a $5/week raise.
8eN0X TIL in 1993 election, Canada's Progressvie Conservative Party lost 154 out of 156 seats. It was the worst election defeat in any Western democratic world.
QNnXk TIL the book 'Theory of Games and Economic Behavior', by mathematician John von Neumann and economist Oskar Morgenstern, led to the creation of an entirely new field of research, known as game theory, which is the study of mathematical models of strategic interactions.
wkRo TIL that between the 14th and 17th century, Europe was prone to incidents of “Dancing Mania” where up to thousands of people danced erratically for days, weeks, or months. Many collapsed from exhaustion; some died.
d5wK TIL when a Pediatrician was involved in a fiery car wreck and was pinned in his burning car, among the fire rescue crew that arrived to save him was a man whose life the doctor had saved 30 years earlier as an infant.