Probably one of the most chilling statements ever made by a tyrant was Caligula's warning: "Remember, I can do anything to anybody." Few tyrants have ever had such total power. Even in Caligula's case, he wielded such power for a relatively short time before...

Revelations that Pakistan's scientists may have helped Iran's and Libya's secret nuclear programs raise worrisome questions about nuclear danger in South Asia, which has been described as the world's most dangerous place. They also call for major policy changes and...