The mind of the polyglot is a very particular thing and scientists are only beginning to look closely at how acquiring a second language influences learning behavior and the very structure of the brain itself.
Learning to speak was the most remarkable thing you ever did.
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We're learning how important it is both to preserve sibling relationships if they work and repair them if they're broken. We're also learning a lot about nonliteral siblings – stepsiblings half-siblings – and the surprising power they can have.