An ancient Roman concrete formula using seawater has made some harbor structures stronger over millennia.
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The Gulf of Tonkin incident was later shown to involve disputed reports of attacks.
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The Ottoman Empire lasted for more than six centuries.
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In 2008, a Norwegian town experienced a strange spiral light in the sky caused by a missile test.
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The 2011 Tohoku earthquake triggered a major tsunami in Japan.
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The saber-toothed cat went extinct around 10,000 years ago.
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In 1971, a hijacker known as D.B. Cooper parachuted from a plane and was never conclusively identified.
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In 1865, a volcanic eruption in Indonesia affected global weather patterns.
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The 1986 eruption of Lake Nyos released a deadly cloud of carbon dioxide.
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