<p>blueazulim, this you’re not writing a frickin’ term paper - if you’re interested in the relative difficulty of languages, there’s no reason not to start with wikipedia.</p>
<p>There are no specific languages required for graduate school. In some ways, familiarity with russian or german would help you in reading published papers in math and science (and perhaps philosophy or literature), but you shouldn’t worry about that now. Chances are, you won’t even end up in an academic program like that, and if you do, you can take those courses later - they would not be among the most important aspects of your application.</p>
<p>You’ll get as much advising on course selection as you’d like before you enroll. Again, I’d encourage you to take a language that you enjoy, not one that you think will help you in the future (unless, of course, you have a specific goal, like working in China).</p>