At the time, it was just a simple, selfless act. The right thing to do. Seventy years later, a young Army captain’s good idea is responsible for saving countless lives.

It was just one incident in the long, rewarding life of Dr. Norman Wall, who is one of the most compelling, relevant and fascinating 97-year-olds on the planet.

He weighs in with the dramatic differences he’s seen during his long medical career (including a front-row seat to the work of Dr. Jonas Salk) and why he thinks today’s doctors are failing their patients in one key area.