Could grandmotherly love help to explain how we became human?

From tools to language to brainpower, there’s no shortage of theories positing why humans went from the savannah to megacities, while, despite very similar DNA, other hominins have more or less stayed put. This video from NPR details an emerging theory of how human societies evolved. According to new research, our ancestors shared parenting within families, which might have led to an increased capacity for cooperation, ultimately opening the way towards the rest of the skills we love to praise in ourselves. Read more about the theory at NPR’s website.