Invited presentation at a meeting of the Old Guard of Summit NJ on January 5, 2021. Brian Kernighan is a professor of computer science at Princeton University and one of the original Unix pioneers at Bell Labs. Brian described his experiences teaching "Computers in Our World," a first year course designed to inform non-technical students how modern hardware, software and communications systems operate, and their ubiquitous role in today's world. It was a 45-minute version of his one-semester talk!