He means this one.
LW 2.0 link: https://www.lesserwrong.com/posts/B7P97C27rvHPz3s9B/gears-in-understanding
He means this one.
LW 2.0 link: https://www.lesserwrong.com/posts/B7P97C27rvHPz3s9B/gears-in-understanding