While Doing Math

 It's no wonder that some educators prefer windowless classrooms.  My son and I were reviewing some basic math skills when he spotted this brightening of a few leaves on a large California Black Oak just outside our dining room window.  How could I resist.  My signature oak first provided a show of Oak Treehoppers a couple of days ago, and now this.  The first flame-red color change that I've noticed in our neighborhood.  Despite the rain, I had to get the camera and head outside for some close-up shots.
Personally, I still prefer classrooms with windows.  Many, if not most, of the best lessons are outside.  We evolved outside.  Why do we insist on spending so much time inside?  I guess it's Edison's fault.