The ancient Egyptians invented the 24-hour day — dividing daytime and nighttime into 12 hours each.
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In 1692, the Salem witch trials led to the execution of several individuals in Massachusetts.
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In 1919, the Boston Police Strike left the city without law enforcement for days.
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In 1938, a radio broadcast of 'War of the Worlds' caused panic among some listeners.
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The 1960 Valdivia earthquake is the strongest ever recorded.
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The Cold War followed World War II.
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The Persian Empire built an extensive network of roads.
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The Treaty of Versailles officially ended World War I.
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Some early mammals coexisted with dinosaurs.
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