Some foreign students in U.S. schools find it challenging to submit grammatically correct, idiomatically accurate papers. So two former Ukrainian graduate students launched an artificial intelligence-driven grammar-proofing program that goes well beyond spell-check. Today, their 8-year-old startup, Grammarly, whose first venture round netted $110 million in May, has offices in Ukraine and the U.S. VOA Ukrainian Service correspondent Tatiana Vorozhko has the story.