The U.S. government has known since the early 1990s about Soviet-era smallpox weapons, and collected circumstantial evidence of programs elsewhere.

The defection of Hussein Kamel was a turning point in the U.N.-imposed disarmament of Iraq in the 1990s.

Snowden has been very sparing about discussing his early life or his personal life.

In Africa through the 1990s, with notable exceptions in Senegal and Uganda, nearly all the ruling powers denied they had a problem with AIDS.

Snowden has yet to tell me anything that was a fact that I have been able to rebut or that anybody in the U.S. government I have talked to has been able to rebut.

Early in 1986, the World Health Organization in Geneva still regarded AIDS as an ailment of the promiscuous few.