Dunbar was a social scientist who calculated that the human brain can only actively manage a certain number of healthy relationships at one time and those relationships are what he defined as your network. These are relationships that have depth and breadth enough that they can sustain droughts of silence at one time. These contain people you can call upon to ask for tasks that go beyond just normal day-to-day activity. These are the people who are going to help you shingle your roof or the people who are going to carry your casket, or to help you find a career. Keep an eye on future 3Ds for ideas on how to maximize your networking skills through effective use of your Dunbar number.