Subject: Reverse Flynn Effect
The Flynn Effect is the observation that since WWII human IQ has generally been increasing. There is a variety of possible explanations, better educational opportunities, improved nutrition and health, family planning, increasing number of tasks that require abstract thought, etc.

However, since about 2010 humans have been getting dumber. This coincides with the arrival of smart phones. Cal Newport has the deets on his blog.

https://calnewport.com/on-the-...