I've used a lot of what comes after this colon in Haber's first paragraph in classes and even though he is (reluctantly) dropping some of them, you should consider going over these classics with students!
"One of the most frustrating aspects of teaching molecular genetics is deciding what not to teach. Twenty-five years ago, my course included a number of “had-to-teach” experiments that established the fundamental concepts about the nature of DNA and of gene regulation:"