The students in Piedmont High School's sophomore acting class had never heard the word "putsch." But they were about to find out what it means. Their class on Tuesday took place inside a bus that doubles as one of four Mobile Museums of Tolerance (MMOT). Parked near Piedmont City Hall for the week, it was outfitted to seat 30, movie theater-style, with three screens projecting films and photos that brought history to life.