Soviet hydrogen bomb inventor's death ruled as suicide.

Grigory Klinishov, a Russian physicist and co-creator of the Soviet Union's first two-stage hydrogen bomb, committed suicide in his Moscow apartment at the age of 92. He left a death note citing grief over his wife's death and his own health issues. Klinishov had worked under Andrei Sakharov in the 1950s and developed a charge for the RDS-37 hydrogen bomb, which was tested in 1955.