Caldecott Award winner Brian Floca gives a heartfelt thank you to the essential workers who keep their cities going during COVID-19 quarantine in this tenderly illustrated picture book. We are here at home now, watching the world through our windows. Outside we see the city we know, but not as we've seen it before. The once hustling and bustling streets are empty. Well, almost empty. Around the city there are still people, some, out...