Punishing selfishness starts young
![](https://natalieparletta.com.au/wp-content/uploads/2020/04/200424_Selfish_boys-1024x576.jpg)
Why do humans (mostly) cooperate? Following social norms to punish others for selfish behaviour plays a part, according to a new study – and this develops across diverse societies as early as middle childhood.
Published by Cosmos.