Dunbar’s number and how speaking is 2.8x better than picking fleas

relationships were structured into a series of inclusive circles, or layers,* with each layer three times the size of the layer immediately inside it.

Dunbar’s number—the suggested cognitive limit to the number of people someone can maintain a social relationship with—is a helpful framework for developing an internal communications strategy.28 At around 150 people, it becomes harder to remember everyone’s name, what team they’re on, and what they’re responsible for.