Catalyst: Earth’s oxidation event

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“Catalyst” connects with a geologist who examines rock samples and oxygen molecules to study planet Earth’s “Great Oxidation Event” 2.5 billion years ago.

Ariel Anbar, PhD

Marble columns with text reading: Arizona Horizon Presidential Preference Results Special
airs March 19

Arizona Horizon Presidential Preference Election Special

A photo of Allison Pataki and the cover of her book,
March 27

Join us for PBS Books Readers Club!

A graphic for the Arizona PBS news show,
airs March 23

This week on Horizonte

Stewart Udall: The Politics of Beauty

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