Logic question: There are 3 perfectly rational wise people. One always tells the truth. One always lies. One always answers randomly. They understand English, but they answer in their own language. "Jar" and "Bay" in their language mean "Yes" and "No" in English, but you don't know which means which. There is a fork in the road and one path leads to prosperity and one to death. You can ask two questions to figure out which way to go. You must direct a question to a single person, and that person will answer without a mistake. What do you ask to whom?

What is wrong with the iPhone security model? What would you change and how? How does this affect user expectations?

What is an object-oriented design for a server computer?

Implement a stack that can be "flipped" at any time.