Catalyst: Gluten-free fad

“Catalyst” talks to nutritionists who are curious about the gluten and the body.

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'Nova' returns this winter with new episodes Wednesday nights

From volcanoes to space exploration, "Nova" explores our world every Wednesday at 8 p.m. on Arizona PBS.

'Call the Midwife' returns: Season 8 airs Sunday nights

Call the Midwife

The wildly successful "Call the Midwife" series begins its eighth season with new drama, comedy and uplifting tales every Sunday night at 7 p.m. through May 19.

'Secrets of the Dead' explores the past through forensics and archaeology

Part detective story, part true-life drama, "Secrets of the Dead" is back Wednesday nights at 9:30 p.m. during March.