For the first time since 1983, the medicine, physics and chemistry Nobel Prizes all went to five American scientists. An American also won the economics Nobel Prize. There is a good deal of information on the Nobel Prizes here.
As might be expected, American science educators are thrilled by this development, but one should not forget that while our top level students and scientists are typically the best in the world, and that the U.S. has by far the largest monetary commitment to research, the science education the average American student receives does not compare well with the rest of the developed world. USA Today has a nice summary article.