29. how did nikita khrushchev and his colleagues change soviet domestic and foreign policy after the death of stalin? 30. why did the soviet union invade hungary in 1956? 31. who built the berlin wall and why? 32. what problems did the soviet union face in 1985 when mikhail gorbachev became the leader of the communist party? what problems did gorbachev himself identify in his nobel lecture? 33. how did gorbachev try to reform the soviet union and why was he unable to save communism? 34. in existentialism is a humanism, what did jean-paul sartre claim is the most important characteristic of human nature? how did he believe human beings must find the values by which to live? 35. in fides et ratio, what did john paul ii argue is the principal error made by most modern philosophers? 36. what happened at the end of franz kafka’s “parable of the law” to the man who journeyed to the castle of the law?