You are amazing. How you can keep it all straight and remember all the technical terms is crazy. I love it tho-I’m 67 -wish I had enough years left to go back to school in biology/physiology but I’m still paying for my accounting degree I got at age 50 😊. I quit school at age 15- got my GED then went on and got college degree at 50-the good that came from that is my insatiable desire to learn-so thank you for all your great material. Kathy