Humans have been so successful because we started going through "memetic evolution", which is where complex behaviors affect brain evolution, and brain evolution affects complex behaviors in a feedback loop. African languages do not have a future tense, indicating they did not evolve in an environment that required future thinking, and thus their brains would not be optimized for such thoughts. That's why they have such poor time management skills compared to white people, who needed to be very future thinking given that they evolved in the north, during an ice age, so food wasn't available for most of the year (i.e. the Smithsonian document is correct). That's also why they have such poor impulse control; they don't think about future consequences before acting.

Humans have been so successful because we started going through "memetic evolution", which is where complex behaviors affect brain evolution, and brain evolution affects complex behaviors in a feedback loop. African languages do not have a future tense, indicating they did not evolve in an environment that required future thinking, and thus their brains would not be optimized for such thoughts. That's why they have such poor time management skills compared to white people, who needed to be very future thinking given that they evolved in an ice age, and food wasn't available for most of the year (i.e. the Smithsonian document is correct). That's also why they have such poor impulse control; they don't think about future consequences before acting.