Cardiopulmonary resuscitation, or CPR, is a technique used to restore blood circulation and breathing in an individual who has stopped breathing and whose heart has stopped beating. Knowing how to properly administer CPR can help save a life in a matter of minutes. But when was CPR invented, and how has it changed over the years? Read on for the answers to all your most pressing CPR-related questions — like when was CPR invented and how has it changed over time? — as well as what the future looks like for this life-saving skill.