Catalyst: Saguaro cactus

“Catalyst” follows a team of scientists who while sequencing the saguaro cactus genome made a surprising discovery. “Catalyst” also joins a Saguaro fruit harvest in the Saguaro National Forest.

In this segment:

Martin Wojciechowski

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'The David Rubenstein Show' explores successful leadership

What makes a truly great leader? And how can leadership be developed into a force for true achievement? David Rubenstein sits down with influential figures to explore their paths to success.

Celebrate the healing power of music in 'Songwriting with Soldiers'

Celebrate the power of music to salve the wounds of war for returning veterans and their families in "Songwriting with Soldiers," a unique collaborative of professional artists working with veterans to tell their stories of war and the return home through song.

'Poldark' rides again on 'Masterpiece' this fall

The “Poldark” saga is drawing to a close in this fifth and final season of drama in Cornwall, airing Sundays at 8 p.m., beginning Sept. 29 on Arizona PBS.