24 years ago, physicist Wolfgang Ketterle left Germany for what he thought would be a fairly brief stint as a post-doc at the Massachusetts Institute of Technology in Boston. In 2001, he was awarded the Nobel Prize in Physics for his work with gases at ultra-low temperatures. And he still lives in Boston and still works at MIT.
Why did he turn his back on Germany? How does he feel about the quality of research going on in his home country? We met the researcher a the World Economic Summit in Davos to find out more.