Learning a second language "boosts" brain-power, scientists believe.
Researchers from University College London studied the brains of 105 people - 80 of whom were bilingual.
They found learning other languages altered grey matter - the area of the brain which processes information - in the same way exercise builds muscles.
People who learned a second language at a younger age were also more likely to have more advanced grey matter than those who learned later, the team said.
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