Irans top nuclear scientist and the man heading the team to remove the Stuxnet virus is assassinated while on his way to work, by a team of machine gun wielding motorcyclists.

This is the latest of several such scientists who have suffered this fate, and no one that we know of has ever been arrested for it.

This shoot down also happened in the most secure district of Tehran, which can't give the other surviving scientists much of a feeling of safety.