Moral Molecule

Human beings can be so compassionate. They can also be shockingly cruel. What if there was a master control for human behaviour? Switch it on and people are loving and generous. Switch it off and they revert to violence and greed. Pioneering neuroeconomist Paul J. Zak has discovered just such a master switch: a molecule in the human brain.

Zak’s colleagues call him Dr Love. They also call him the v...