Henry Isham has taught seventh and eighth grade, analyzed financial statements, and assayed precious metals. He traveled a lot when he was younger and is now retired. Isham garden...view moreHenry Isham has taught seventh and eighth grade, analyzed financial statements, and assayed precious metals. He traveled a lot when he was younger and is now retired. Isham gardens and plays tennis as much as possible. When the COVID-19 shutdown loomed, he decided to pursue answers to a question which had interested him for some time.view less