I finished foundation this year too. I really didn’t like how he ended it. Fun fact I learned from reading Foundation’s Edge is that he didn’t want to write Edge or Foundation and Earth.

Gnome Press owned the original series and he didn’t get any royalties for them. In 1961, his current publisher Doubleday acquired them and for 20 years he told them no to writing more Foundation books. In 1981 Doubleday said they would pay him 10 times his normal rate and that is when he wrote Foundation’s Edge.

This was all printed in the front of my copy of Foundation and Earth. Titled as “The Story Behind the Foundation”.