Comment Re:What a surprise! (Score 5, Informative) 757
I am a faculty at a US university, advising several such foreign students and postdocs.
Many of them choose to leave the US after their PhD or postdoc simply because there are often better opportunities elsewhere, especially for those interested in an academic career. Many countries are ramping up their investment in education and research, while the trend in the US is negative. In the 70's and 80's, US universities were the top. Now, researchers are often offered much better support, infrastructure, ability to grow a research group, and even salary, in other countries. So they leave.
Three of the people who worked with me are now professors; none of them is in the US.
What this says for the future pre-eminence of US science... wait, which pre-eminence?