What does the “what-cheer, what-cheer” song of a northern Cardinal, an ultra light scooting across the sky, a fluffy dog-shaped cloud, and a Little Free Library have in common? Nothing, really, other than being some of the items I stored together in a “memory chain”  in an ongoing quest to challenge my brain. While visiting my daughter at her new home in Michigan this summer, I was out walking around her neighborhood one evening. I felt grateful for the ability to walk briskly and at the same time, listen to or observe all the sights and sounds nearby. This isn’t something I take for granted, after watching both of my parents lose these…