Solar power has become cheaper than any other energy source in history — costs have dropped 90% since 2010.
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The Trojan War is part of ancient Greek legend.
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The Manhattan Project was a secret U.S. program during World War II to develop atomic weapons.
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The NSA’s ECHELON system monitored international communications during the Cold War.
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The Crusades were a series of religious wars during the Middle Ages.
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The 21st Amendment repealed Prohibition.
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The Ottoman Empire lasted for more than six centuries.
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Ancient Egyptian armies used chariots in battle.
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The ancient Roman aqueducts transported water over long distances.
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