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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Visit the last unexplored places on Earth in 'Expedition with Steve Backshall'

There are still parts of our planet yet to be discovered. Explorer and naturalist Steve Backshall pursues incredible journeys and world firsts — unclimbed peaks, unexplored cave systems and uncharted landscapes — setting foot where no human has been before. "Expedition with Steve Backshall" comes to Arizona PBS Wednesdays at 9 p.m. starting Jan. 15. 

'Nova' delivers stories from the front lines of science

"Nova" explores new discoveries and how we have come this far on Wednesdays at 8 p.m. on Arizona PBS.

'Independent Lens' tells unforgettable stories about people and history

The Emmy Award-winning anthology series featuring unforgettable people, communities and moments in history returns to Arizona PBS on Mondays at 9 p.m. starting Oct. 28.