if one person could learn a billion things in a million years.  a million people can learn the same billion things in ONE year by slicing the billion things between them. an easy way of thinking about intelligence. there is no standardized universal intelligence. no one has enough lifetime to understand what that would be. if you could feed everyone's ideas on literally everything into an AI machine and force it to somehow aggregate an impossible scope of ideas into a singular number you may have an idea of how individual intelligence works.