Open Source Intelligence ... on Iranian concrete.

My new darling, Wired's Danger Room has an interesting story about the development of super-strong concrete in Iran. One of the Danger Room's readers is an MA in Civil Engineering and participated in a contest, with among others, a number of Iranian Engineering students. They had made some ultra strong concrete and by googling their professor, it was clear that he was involved with concrete for nuclear reactor construction.

This is interesting with the ongoing US effort of making larger and crazier bunker-busters in mind.

That is a real-life example of how grey area information is freely available for use, if you know where to look and what to look for.