It is a lot of fun to learn about events that happened in places where we've been. The Nez Perce lived in Southeastern Washington, Central Idaho, and Northeastern Oregon. I guess they had some amazing horse herds. I read one of their stories about a monster that Coyote kills. He cuts the heart out. I almost drove off the road when I saw the Heart of the Monster down in Idaho when I was on a trip. It's a small hill that I had only seen pictures of before.
I'm glad to hear that you're doing so well with your math. I bet you'll learn those multiplication facts really fast once you get to them!
That mail car with the skies reminds me of the Christmas television show
Santa Claus is Comin' to Town. Have you seen that? The narrator is a mailman who has a car like that one. I never knew they were for real!