Want to know what makes us stand apart from our ape cousins?
Cooperation—no other animal does it quite like us. Developmental psychologist Michael Tomasello explains why if chimps had a self-help bestseller, it would be titled, How to Outwit Rivals and Get More Fruit.
What stands out is our exceptional capacity for generosity and mutual trust, those moments in which we act like no species that has ever come before us.