But it does mean that far from being an aberrant behaviour, psychopathy may be disturbingly normal.

ECONOMIST: Evidence that psychopaths are born, not made

This is particularly worrying in the light of work which shows that pathological behaviour in childhood is a good predictor of a lifetime of aberrant behaviour.

ECONOMIST: Diet and the unborn child

Until recently, discussion about British Islam reflected an assumption shared by the government and its Muslim interlocutors: that extremism was alien to most British Muslims, and squeezing it out was a simple matter of finding the right words to explain that violent behaviour was an aberrant reading of Islam.

ECONOMIST: British Muslims: Miles apart | The