What impact did Russian internet “trolls’’ have on the 2016 US presidential election?

Also: we hear about wealthy Russians coming to America to give birth to US citizens; we learn why the poet Langston Hughes went to the USSR to work on a Soviet propaganda film in 1930s; we visit a Korean-Uzbek-Russian cafe in New York; we meet two science fiction writers who advise the US government on the future of warfare; and we find out why Tchaikovsky's concerto No. 1 had its world premiere in Boston.

(Image:The Kremlin stands in Red Square in Moscow on March 7, 2017 in Moscow, Russia. Credit: Spencer Platt/Getty Images)