One moment can change the course of your entire life. For Diane Grimard Wilson, it was a car accident at a stop light.

When you read Be Fearless, you will see it is clear that Jean Case knows a thing or two about being fearless, making big bets, being bold, and taking risks.

There are few days that divide your life into two parts: before times and after times. For Liya Shuster-Bier, January 11, 2018, was one of those days. That morning, doctors discovered an 8 by 10 cm tumor in the center of her chest. Within days and on the cusp of her 30th birthday, she was diagnosed with stage 2 primary mediastinal b-cell non-Hodgkin lymphoma.

Dog mushers, sailers, Olympic runners. What do these athletes all have in common? Endurance. And today we're learning from them how to get through the rest of this ongoing pandemic.

Martha Teichner has been a correspondent for “CBS Sunday Morning” since December 1993, where she’s equally adept at covering major breaking national and international news stories as she is handling in-depth cultural and arts topics.