Comment by kwhitefoot

Who does that? Most people learn only their own language. A substantial number learn one other language, generally English. My own experience (bi-lingual Brit living in Norway working with people from 17 different countries) suggests that a very small proportion go beyond that. I'm excluding those who have a smattering of another language such as most Brits like me who had to take French and Latin at school but never got beyond being able to ask for a beer in a bar. Some of my Polish colleagues can get by in Russian as well as English but not many of those under 30.