The largest empire by percentage of world population was the Achaemenid Persian Empire, covering about 44% of humanity.
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The Ice Age ended gradually as global temperatures rose.
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Some early mammals coexisted with dinosaurs.
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The Permian extinction was the largest mass extinction in Earth's history.
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The Permian extinction eliminated most marine species.
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The first Olympic Games were held in ancient Greece.
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Ancient supercontinents existed long before modern continents formed.
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The Indus Valley Civilization built advanced drainage systems.
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The NSA's PRISM program collected digital communications under classified authority.
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