On average, there are three to five people in our lives with whom we have a very close relationship (close friends and/or family), around ten with whom we have close friendships, a larger group of about 30-35 people with whom we frequently interact and around one hundred acquaintances we come into contact with every now and then in our daily lives. In other words, we interact on a regular basis with about 150 people. This number is known as the “Dunbar number” and it indicates the amount of friends that our brain can handle, according to the theory formulated in the 1990’s by Robin Dunbar, a professor of anthropology at Oxford University, who also participates in this new scientific study.