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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'Nature' explores the wild on Wednesday nights

From the remarkable octopus to a river of dreams, experience compelling stories of the natural world as "Nature" returns to Arizona PBS Wednesday nights at 7 p.m.

Travel to remote 'Islands of Wonder'

Journey to three of the most exotic, mysterious and remote islands on the planet: Madagascar, Borneo and Hawaii. Isolated from the rest of the world, they harbor remarkable wildlife and pioneering human communities found nowhere else on Earth.

'Van Der Valk' solves baffling crimes in Amsterdam

Set in Amsterdam, new series "Van Der Valk" follows the work of Commisaris Van der Valk (played by Marc Warren), a street-smart and unapologetic Dutch detective who navigates the lively and enigmatic city, solving mysterious crimes using astute human observation and inspired detection.