Gleefully following the victories of the people against one government after another in North Africa and the Middle East, I keep recalling that these revolutions were ultimately triggered by the death of just one young man, Mohamed Bouazizi, in Tunisia.

That proved the tipping point, the final straw that raised popular resentment against decades of corruption, repression and injustice to what nuclear scientists call ‘critical mass’, resulting in the chain reaction that’s already blown several regimes away and still threatens a great many others.