I am about to learn a second language and was interested in what your opinions were on a good path to take with physics in mind. Initially I thought Latin would be a good option for nearly all sciences. But then I thought about it and realized that, although it may be useful, maybe not as much so as it would be for Biology or many other sciences. And that is when German, French and even Chinese came to mind. So my question is. Which language (besides english) do you think is the best to learn with a career in physics in mind. And why?