Jonah Stiriz, AFD paramedic/firefighter, and Jennifer Baer, AEMT/firefighter, demonstrate how to perform CPR. In front is an Automated External Defibrillator (AED), a medical device that can analyze the heart’s rhythm and, if necessary, deliver an electrical shock, or defibrillation, to help the heart reestablish an effective rhythm, says the American Red Cross.– photo by Mary