My entry into the "Two Things About" discussion: History and History Teaching. Good for introductory lectures. It has been noted in the past that "earlier antecedents" is redundant. That is true, but it's how I worded it originally, and I still like it: it emphasizes that the immediate causes are not always the important ones, and those causes have causes.... etc.
You can find the original "Two Things" page at http://www.csun.edu/~dgw61315/thetwothings.html