The discovery of prions by Stanley Prusiner in 1982 revealed a completely new class of infectious agent.
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The Sahara Desert was once home to ancient civilizations.
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The French Revolution began in 1789.
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The Battle of Hastings in 1066 changed the course of English history.
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Humans often prefer immediate rewards over delayed ones.
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The Mongol Empire became the largest contiguous land empire in history.
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The Watergate scandal led to President Richard Nixon’s resignation in 1974.
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The Battle of Salamis was a major naval victory for the Greeks.
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