Also what I liked about the series is the multiple logical explanation of things which seem equally convincing but ultimately wrong. e.g the location of the sec

Also what I liked about the series is the multiple logical explanation of things which seem equally convincing but ultimately wrong. e.g the location of the second foundation and later of earth. In this logical recursion you have to keep track of the level your are in till ultimately a simple explanation is revealed. Sometimes it feels too much of a coincidence, but I enjoyed the mental gymnastics.