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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Jane Austen's last work brought to life in 'Sanditon'

Jane Austen was chronically ill with a mysterious disease in early 1817, when she turned her thoughts to a happier subject. She started work on a witty and delightful novel set in a seaside town. She never finished it. Now, noted screenwriter Andrew Davies picks up Austen’s plot and takes it in a glorious and satisfying direction.

Visit the last unexplored places on Earth in 'Expedition with Steve Backshall'

There are still parts of our planet yet to be discovered. Explorer and naturalist Steve Backshall pursues incredible journeys and world firsts — unclimbed peaks, unexplored cave systems and uncharted landscapes — setting foot where no human has been before. "Expedition with Steve Backshall" comes to Arizona PBS Wednesdays at 9 p.m. starting Jan. 15. 

Masterpiece brings 'Howards End' to Arizona PBS

Follow two independent and unconventional sisters and the men in their lives seeking love and meaning as they navigate an ever-changing world in this fresh take on E.M. Forster’s masterpiece "Howards End." The miniseries airs Sundays at 7 p.m. starting Jan. 12.