ChronoFive
Play today’s puzzle
Setting the scene
Short modular videos mapped neatly to attention spans and phone data caps of the late 2000s.
What happened
Grant funding from Gates and Google scaled content production beyond one whiteboard voice.
Why it still matters
Pandemic remote schooling spikes stressed servers and teacher workflows alike. Memorable detail: Sal's smooth marker-on-blackboard ASMR accidentally became a genre.
Background
Free mastery-based practice influenced edtech standards and SAT partnerships while debating screen-time equity.