Low Red Cell Count
Trust is the lifeblood that keeps societies alive, and by extension, what keeps the lives of hundreds of millions of people from harm. Without trust, societies can't exist. You need to trust that your employer will honor your salary, your bank to keep your money safe, and your Angie's list-sourced plumber to not show up with an ax to chop your head off. At the beginning of human existence, morals and reputation within the tribe represented a kind of currency of value, which was used to interact cooperatively and constructively to further the shared goals of survival. Trust, it can be argued, is behind human's success on this planet. As hunter-gatherer groups grew in size, our brains' mental capacities to assimilate and process trust maxed out. After all, keeping a mental score of the number of people that have betrayed you in the tribe reaches a limit (called the Dunbar number ) fairly quickly. Due to this mental ceiling, humankind demographic growth was constricted...