Sergey Prokudin-Gorsky
Sergey Mikhaylovich Prokudin-Gorsky (, ;  – September 27, 1944) was a Russian chemist and photographer. He is best known for his pioneering work in colour photography and his effort to document early 20th-century Russia.
Gerontocracy
In the Soviet Union, gerontocracy became increasingly entrenched starting in the 1970s, at least until March 1985, when a more dynamic and younger, ambitious leadership headed by Mikhail Gorbachev took power. Leonid Brezhnev, its foremost representative, died in 1982 aged 75, but had suffered a heart attack in 1975, after which generalized arteriosclerosis set in, so that he was progressively infirm and had trouble speaking. During his last two years he was essentially a figurehead.