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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Kennedy Center at 50

Kennedy Center at 50 celebration will be hosted by six-time Tony Award® winner Audra McDonald and feature the National Symphony Orchestra.

Great Performances at The Met “Three Divas of Versailles”

Great Performances presents "Three Divas of Versailles" Three-time GRAMMY winner Isabel Leonard joins Nadine Sierra and Ailyn Pérez to perform timeless selections by Mozart, Offenbach and Bizet including “Voi che sapete”

In Their Own Words: Elon Musk

Elon Musk is part of a new breed of "thrillionaires" — high-tech entrepreneurs using their wealth to turn science-fiction dreams into reality