Soon, out of curiosity you try to touch one of the spots and with that you are abruptly yanked out of orbit, into the atmosphere and 'slam' into a person at that spot. When you wake up some minutes later, you find that you're now in the body of the leader of the tribe. His/hers and your personality are in a strange meld of minds, sharing memories, personalities and experiences.
If you don't want to meld with anyone, you can slow down your perception of time and thus speed up the passage of it. In layman's terms, you can fast forward... Also, if you've been actively melding with descendants of a single tribe then at Anno Domini (A.D.) 2000, you leader descendants start developing psychic powers. At first you get telepathy and telekinesis that get more powerful with each descendant and leader melded with, until your reach the stage where you can hear and process every thought of every thinking being within five hundred kilometers and see what they see at the same time and also be able to lift the size and weight of a whole skyscraper (think WTC size) with all internal details included and make it fly at one hundred nautical miles per hour.
In the end after all other powers develop, you get the ability to forcibly meld people, other than leaders and their direct descendants, permanently into your 'Mental Collective' as long as they are withing five kilometers.
Anyway, what would you seriously think and do after you get melded with your first leader.