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Being bilingual slows brain aging and can prevent Alzheimer’s, researcher says

Humans are organized into around 200 nations, yet there are roughly 6,000 languages in existence. It therefore seems obvious that bilingualism is much more common than many of us might assume. This is an increasingly visible fact that appears to undermine the predominant model of “one state, one language,” a consequence of unifying previously distinct regions and cultures into larger nations.