How to learn a new language, according to a guy who became fluent in 4 in just a few years

If you had hours of free time every day and thousands of dollars to spend on tutors and classes, of course you could learn a new language.  Unfortunately, that's not the situation most adults find themselves in. As a result, many people assume they've got no chance of ever mastering a foreign tongue. But that's where they're wrong. Just ask opera singer Gabriel Wyner, who achieved fluency in four languages — Italian, German, French, and Russian — in the span of just a few years. (He's curre...