1 person in 100 will share your GENERAL interests, will have things in common in terms of aptitudes, abilities, talents. Of those 1%, 1 in 100 will mesh well with you in terms of chemistry, attitudes, tastes. This means that for every 10,000 people in the world, there is likely to be ONE person who really GETS you ... they won't all be around you geographically; they will come from very different backgrounds; they will be different ages ... BUT they will be the FEW who will kind of persons who are able argue with you over a passionately shared interest and yet continue to think of you as a friend. You don't yet know all these people, but in order to be INTELLECTUALLY fit, you need to go out and meet the 1% of the 1% ... you can't meet them all ... of the 1% of the 1%, START with ONE PERSON, ie the 1% of 1% of 1% OF your 800,000 person tribe of the 1% of the 1% of 8 billion people.