Nuclear: from one country to the other
Nuclear research and more specifically nuclear weapons are always subjects to many discussions on the web through blogs for example. They are nearly always related to a specific country. The picture below, obtained by BlogPulse, shows how the word nuclear goes from one country to the other.
As you can see on the plot, the word nuclear is now more likely to be related to Korea than Iran. Although the nuclear “picture” is certainly harmful for the concerned country, it can change nearly from one day to the other.