Catalyst: Wildlife migration corridors

Biologists install digital cameras and microphones around wild habitats to observe where endangered animals migrate. By mapping wildlife movements conservationists can advise governments how to build infrastructure that protects biodiversity.

WATCH: See more from season 2 of “Catalyst”

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Catalyst: Acoustic Ecology Lab

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Andy Martinez

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'Great Performances' highlights opera trailblazer Birgit Nilsson

Great Performances "Birgit Nilsson"

On Sunday, March 31, at 2 p.m., celebrate the life of Swedish soprano Birgit Nilsson, the face of opera from the 1950s-70s.

'Silent Witness' returns with new crime-solving dramas

Silent Witness

"Silent Witness" is back with more crimes, detectives, forensics and mystery. Tune in Sundays at 10 p.m., beginning March 24, on Arizona PBS.

'Innovating the Future' explores ways to improve society

New America CEO Anne-Marie Slaughter hosts "Innovating the Future" Friday nights at 7:30 p.m. on Arizona PBS, part of a partnership between Arizona State University and New America that highlights stories about blending technology and public policy to improve America's future.