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Cameron Spencer/Getty Images/Getty Images AsiaPacBillboard has revised its system of removing songs from the Hot 100 singles chart once they've gotten too old to qualify as contemporary hits. -
Far-Flung Postcards is a weekly series in which NPR's international team shares moments from their lives and work around the world.
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Scientists have found the first compelling evidence that cognitive training can boost levels of a brain chemical that typically declines as people age.
