Boris Grigorevich Kolker (Russian: Борис Григорьевич Колкер; born July 15, 1939, in Tiraspol, Moldavian ASSR, Soviet Union) is a language teacher, translator and advocate of the international language Esperanto. He was until 1993 a Soviet and Russian citizen and since then has been a resident and citizen of the United States residing in Cleveland, Ohio. In 1985 he was awarded a Ph.D. in linguistics from the Institute of Linguistics of the Academy of Sciences of the USSR in Moscow.
HistoryLayer draws the world as it was in any year from 123,000 BCE to
2026. Move the slider and the borders redraw for that year; the map
carries 23,890 events, 12,790 people, 837 wars and 13,183 cities, each
one readable in place. Signing in is optional and lets you keep what
you find.