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More than 5 million people in the U.S. are living with Alzheimer's. Now British researchers say they have developed a blood test that could reveal early changes in the brain related to the disease - before a patient has symptoms

More than 5 million people in the U.S. are living with Alzheimer's. Now British researchers say they have developed a blood test that could reveal early changes in the brain related to the disease - before a patient has symptoms. CBS News' Alphonso Van Marsh reports.

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Secretary of State John Kerry met with Russian Foreign Minister Sergey Lavrov in London. Kerry issued a set of proposals, including for Russia to call off Crimea’s referendum on joining the Russian Federation, but Lavrov dismissed virtually every one.

Secretary of State John Kerry met with Russian Foreign Minister Sergey Lavrov in London. Kerry issued a set of proposals, including for Russia to call off Crimea’s referendum on joining the Russian Federation, but Lavrov dismissed virtually every one. Margaret Brennan reports.

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