Describing human intelligences as self-drivers on the highway of progress, one may build the following dictionary with the help of OP's graph Traffic density

Describing human intelligences as self-drivers on the highway of progress, one may build the following dictionary with the help of OP's graph Traffic density -> urban pop. density Traffic flow -> rate of new ideas productively implemented Partial observability -> democracy* Reinforcement learning -> augmenting individual expression Oxygen/lithium -> money *Incorporating further insights from OP: https://news.ycombinator.com/item?id=43589398 https://news.ycombinator.com/item?id=43589398