Although the Israeli-Palestinian conflict has been around for generations, it still has the capacity to surprise. Even the experts are confused by the current violence that has been roiling Jerusalem for weeks now. Is this the long-awaited third intifada? What is causing it? Why is it centered in Jerusalem, not the West Bank? Who is leading it, and why are the principal actors teenagers with household knives? In fact, similar questions were asked at the beginning of the two previous intifadas, and of the Palestinian Revolt during the British Mandate. Why now? What for?