Catalyst: Earth’s oxidation event

“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.

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In this segment:

Ariel Anbar, PhD

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Celebrate the life and talent of Perry Como

Join hosts Peter Marshall and Nick Clooney to enjoy Perry Como's hit songs from long-lost and restored episodes of his 1950s-19802 TV shows.

Celebrate the 'Les Miserables' 25th Anniversary

Celebrate the legendary musical with a stellar cast including Alfie Boe, Nick Jonas, Lea Salonga, Colm Wilkinson, Norm Lewis and Ramin Karimloo.

Meet trailblazing women of history all summer

As part of our celebration of the 100th anniversary of the passage of the 19th Amendment, Arizona PBS is sharing stories of women to continue to shatter the glass ceiling and transform modern history. From those who fought for women’s constitutional right to vote in the United States to present-day changemakers, meet trailblazing women who have changed the course of history.