The program, taking the same title, is presented in two-hour installments this Tuesday and next, and by the time it’s over, you will have heard Mr. Ferguson call his six essentials of Western dominance “killer apps” about a thousand times. (See, smartphone-using young people, history is relevant to you!) He’d better hope the term doesn’t have as short a shelf life as, say, “floppy disk,” or this program is going to sound awfully silly in a few years.