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Today in History for Aug. 21: Coup against Soviet leader Mikhail Gorbachev fails

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Highlights of this day in history for Aug. 21: Soviet coup against Mikhail Gorbachev fails; Exiled revolutionary Leon Trotsky murdered in Mexico; Nat Turner leads a slave rebellion; U.S. flag gets 50th star; Count Basie and singer Kenny Rogers born.

Global Warming: Salty water northwest of San Francisco threatening farms and cities

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The Sacramento-San Joaquin River Delta, a huge estuary northeast of San Francisco, supplies water to cities and farms across California. But a historic drought is making the delta's water increasingly salty, forcing farmers and cities to adapt.