Fighting the plague of contemporary stupidity requires identifying it with a knife and classifying it without mercy. Hence the very useful and very impertinent dictionary of Piergiorgio Odifreddi, a mathematician who fires his vitriolic projectiles to unmask the most annoying manifestations of imbecility. Neither the intellectual aristocracy nor the common people are spared here. Not even God is saved here. Here it is taught to know the great theater of the world.