Explain the significance of cleaning. What purposes does it serve for the people of the silo? Why does Bernard expect war if a cleaning fails? How are the cleaners tricked into cleaning?

Why does the IT department possess so much power in this post-apocalyptic landscape? What contributes to its elite status?

What is the significance of the past uprisings for the inhabitants of the silo? What does the knowledge of past uprisings do psychologically? What affect has it had on the current culture and rules of the silo?