How a Missing Penny Explains the Conservation of Energy
Energy is the answer to so many questions. Pull back a spring-powered toy car and rolls forward. Why? Energy. You used your phone all day and it suddenly shut down. Why? No energy. A child eats six bags of M&Ms and runs around screaming and giggling because he has energy. But then he doesn\u2019t want to clean his room because he has no energy. But what is energy? Ah\u2026 that is the real question. To answer it, let me start with a story about three friends, Alby, Bobby, and Cami.