As the trip ends, clean energy entrepreneurs help the roadtrippers grasp their own power.

WATCH: Friday, September 22 at 4pm

Follow the 50-year career of preeminent First Amendment lawyer Floyd Abrams. See how his landmark cases—from the Pentagon Papers to Citizens United to Clearview AI—helped define free speech as it is known today. Join Dan Abrams, Ari Melber, Nina Totenberg and more as they explore how Abrams' career has shaped major changes in law, public discourse and civic action since the 1960s.

WATCH: Friday, September 22 at 9pm

The experiences of young people who struggle with mental health challenges.

WATCH: (Part One ) Monday, September 25 at 10pm, (Part Two) October 2 at 10pm

A suicide attempt left 16-year-old varsity cheerleader, Emma Benoit, paralyzed, but propelled her on a mission to use her painful experience to help others find hope, while shining more light on the suicide epidemic that is taking the lives of 20 young people every day in the United States.

WATCH: Friday, September 29 at 5pm

Celebrate the new class of Hispanic Heritage Award honorees.

WATCH: Friday, September 29 at 9pm

See how Cesar Chavez and the farmworkers’ movement were influenced by music and the arts.

WATCH: Friday, September 29 at 10pm

The Houston Astros cheating scandal and what it says about baseball today.

WATCH: Tuesday, October 3 at 10pm

Witness the dramatic history of Earth, from its birth to the emergence of humanity.

WATCH: Wednesday, October 4 at 9pm