JFK wasn't accepted. Also should accept last name only, as is custom on these quizzes. Specifically he was killed in 1963. Also, America and Russia is not a correct answer for the cold war question. Russia did not exist at the time so that should be either USSR or Soviet Union. And should accept USA/United States/United States of America. Also please don't require the "and" for questions like this.
So agree. Tried Kennedy, John Kennedy, John F. Kennedy, John Fitzgerald Kennedy, and I tried USA & USSR, The United States and Russia, US and USSR, etc. Also, several people are often credited with being the smartest man in the world, including Christopher Langan, Antony Stark, and Terence Tao. It depends on the criteria used. For my money, my husband holds that title as he chose me to be his wife and has stayed with me these 40+ years.