Measuring the revolution wave

NEW YORK — A prediction three months ago that popular protests would soon topple a dictatorship in Tunisia, sweep Hosni Mubarak from power in Egypt, provoke civil war in Moammar Gadhafi's Libya, and rattle regimes from Morocco to Yemen would have drawn serious skepticism. We knew the tinder was dry, but we could never know how or when it would combust. Now that it has, how far can the flames