Research on bilingualism has shown that people who have balanced fluency in two or more languages are better:

When discussing comparative and absolute advantage, which best describes specialization? developing expertise in certain types of production limiting the types of goods and services produced targeting specific consumers and retailers producing certain items for specific market segments the answer is: the act of limiting the kinds of goods and services produced

Who gave the famous "i have a dream" speech at the march on washington?

The two-factor theory of emotion was proposed by