Leah Bartell in 1994. Leah Bartell hide caption

Bill Price, circa 1971, shortly before his fateful encounter. Bill Price hide caption

Julie's husband was always her navigator on road trips. After he died, Julie got lost on her first trip without him. Julie Cadwallader Staub hide caption

Nancy Pardo and her husband Tom. Nancy Pardo hide caption

Bob Cialdini was ready to sign a contract to play baseball professionally in the minor leagues, but he walked away from that chance after the scout gave him some advice that changed his life. Bob Cialdini hide caption

When Nicole George-O'Brien was experiencing a seizure while driving over a bridge, a stranger jumped into action to make sure she and others on the road that day were safe. Nicole George-O'Brien hide caption

Linda Reddish was worried about flying with her newborn, but a woman who was a pediatric nurse made sure the flight went smoothly for Reddish and her baby. Linda Reddish hide caption

In the 1970s, Cynthia Page was working as a copywriter in New York City and living in New Jersey. Cynthia Page hide caption

Nearly 20 years ago, Jeff Fister was in a car accident with one of his children. They weren't injured, but it was still overwhelming until a stranger from a nearby healthcare center came and helped soothe the child. Jeff Fister hide caption

Jessica Israelsen (first from the left in the second row from bottom) in 2003, when she first joined the U.S. Air Force as a medical technician. In 2008, when she was struggling financially, her unit purchased Christmas gifts for her family. Jessica Israelsen hide caption

Jackie Briggs had a rose-shaped birthmark on her upper arm. One day a stranger noticed it and asked a question about the mark that ended up saving Briggs' life. Jackie Briggs hide caption

Joe Arrigoni is the full-time caretaker for his wife Joani who has early onset Alzheimer's disease. Joe Arrigoni hide caption

Early in her career, therapist and author Lori Gottlieb had a patient with a terminal cancer diagnosis. When her patient died she was comforted by a stranger who turned out to be another patient. Rohina Hoffman hide caption

Joy Ladin's unsung hero responded to her need and her disability. Joy Ladin hide caption

Walter Delgado often thinks of Modesto, a man he met while traveling to the U.S. from El Salvador. Walter Delgado hide caption

NPR's Mary Louise Kelly, host of All Things Considered, found her own unsung hero when a stranger reached out to tell her he found her wallet that she had lost on a walk home. Nicholas J. Boyle hide caption

Lila Hoffa struggled to express herself in writing until she met her third-grade teacher showed her a way to bring all her stories to life. Christine Newell hide caption

John Moe is a writer and host of the podcast Depresh Mode with John Moe. John Moe hide caption

Wendy McDowell has used her childhood experience of getting deserted at an airport as a teaching tool for her son. Wendy McDowell hide caption