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Also in this episode:

Catalyst: animal immune systems

In this segment:

Manuel Aviles-Santiago, PhD,
Tahora H. Nazer

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'No Passport Required' returns for a second season to Arizona PBS

"No Passport Required," hosted and executive produced by renowned chef Marcus Samuelsson, will return to Arizona PBS for a preview of its second season on Friday, Dec. 13, at 8 p.m. The full season will premiere Jan. 20, 2020.

Detective odd couple 'Shakespeare and Hathaway' return

The unlikely detective duo of return to Arizona PBS for a second season beginning Thursday, Sept. 5, at 9 p.m. on Arizona PBS.  This quirky crime drama is packed with corpses, comedy and cracking mysteries.

'Frontline' examines controversial newsmakers

Investigate news and newsmakers Tuesday nights on Arizona PBS. Tonight: See how the state governments and Wall Street led America’s public pensions into a $4 trillion hole.