2,300-year-old Chinese chemistry formula deciphered after analyzing ancient coins

Knife coins used in ancient China that were analyzed in the study. (The Trustees of the British Museum/CC BY-NC-SA 4.0) Knife coins used in ancient China that were analyzed in the study. (The Trustees of the British Museum/CC BY-NC-SA 4.0)

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WATCH LIVE | Ian makes landfall in southwest Florida as Category 4 hurricane

Hurricane Ian made landfall in southwest Florida near Cayo Costa on Wednesday as a catastrophic Category 4 storm. About 2.5 million people were ordered to evacuate southwest Florida before the storm hit the coast with maximum sustained winds of 150 mph (241 km/h).

One sightseer witnesses the receding waters of Tampa Bay because of low tide and tremendous winds from Hurricane Ian with downtown in the distance in Tampa, Fla., Wednesday, Sept. 28, 2022. (Willie J. Allen Jr./Orlando Sentinel via AP)

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