Julius<span> and </span>Ethel Rosenberg were<span> United States citizens who spied for the Soviet Union and </span>were<span> tried, convicted, and executed for conspiracy to commit espionage.</span>
Maybe the old man is talking about reincarnation and when he returns it’ll be a different time therefore requiring change. Change in science, writing, and overall human advancement.
The continents of the Eastern Hemisphere are Africa, Asia, Australia, and Europe (and part of Antarctica).