There are a seemingly infinite number of studies and reports out there on the value of a second language—everything from increased business opportunities to an enhanced ability to empathize or to think creatively. Mastery of a second language is supposed to increase potential lifetime earnings, and possibly stave off dementia and Alzheimer’s. It's also part of every Bachelor of Arts degree, and therefore a graduation requirement for many college undergraduates. So if learning a second language is part of your college future, how do you choose which one to study?