i'd also add that more than the new words/sounds/phonemes the differences in grammar between languages make your thinking more flexible. the order of nouns and

i'd also add that more than the new words/sounds/phonemes the differences in grammar between languages make your thinking more flexible. the order of nouns and adjectives, or languages where every sentence ends with the verb and so on, all these contribute to a person having better cognitive capacities, from simply learning foreign languages.