<p>English is the international language of advanced research. Just Monday I was at the University of Minnesota Mathematics Library, and I saw a journal published in Japan that was founded about fifty years ago, with a journal title in Esperanto. All of the articles in the journal were in English--all of the article authors had Japanese names and were affiliated with Japanese universities. There is still a fair amount of original mathematics research first published in French, but most of the German journals consist entirely of articles in English, and generally if you page through scientific journals these days you see much more English that you would have a generation ago. Americans can go abroad to join research teams, and do, because of this language environment worldwide. </p>
<p>This returns to my point earlier in this thread. Lots of native speakers of other languages use English as their language of research collaboration, so lots of use of English in the scientific community includes accents, vocabulary choice, and grammatical patterns beyond the range of conversational usage in America. That's just the way that life is these days. Students in the United States are getting a good education if their undergraduate instruction comes from people who were born all over the world.</p>