Tomorrow I expect to sit with my extended family at my sister’s house and consume copious quantities of yummy food. After that, my and her kids will destroy her house in cute ways that will delight the grandparents. Good times. That in itself is a reason for gratitude. Given the fact that most humans who have ever lived spent every winter nearly starving to death, the abundance of food and material comfort at our disposal is nothing short of miraculous. And the fact that we’re all healthy...