Catalyst season 1 finale: Spiders and silk

“Catalyst” concludes season 1 with a look back at how spiders could help us strengthen fabrics and materials we use in everyday life.

In this segment:

Dr. Brian Cherry,
Dr. Jeffrey Yarker

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‘A Capitol Fourth’ celebrates Independence Day with host John Stamos

"A Capitol Fourth" continues its 39-year tradition of celebrating our nation’s independence on the West Lawn of the United States Capitol building.

'Nova' delivers stories from the front lines of science

From Viking armies to space exploration, "Nova" explores our world on Wednesdays at 8 p.m. on Arizona PBS.

Explore 50 years of activism by Chicanos Por La Causa

Chicanos Por La Causa: Dime Quien Eres

The documentary explores the roots of Chicanos Por La Causa as a group of young students protesting academic discrimination and racial injustice at their Phoenix high school and its growth into one of the largest Latino organizations in the country.