The U.S. is dotted with historical markers. You can usually spot one as a plaque on the ground or a metal sign. “… we found more than 35,000 different groups and individuals and societies and towns ...

Last June, my kindergartener came home on the last day of school with a folder of avant-garde “How to flip a pancake” writing samples and a pencil case full of not one, not two, but ten uncapped ...