Catalyst: inclusion and exclusion bias

“Catalyst” studies how, more than feelings, you can actually measure why it hurts when someone is excluded by others because of their identity.

In this segment:

Alisia Tran

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'Unforgotten': A cold case tests old friendships

A third season of cold case investigations and emotional roller coasters in "Unforgotten" airs Saturdays at 9 p.m., beginning Sept. 14 on Arizona PBS.

'Great Performances: Now Hear This' takes a musical journey across Europe

Great Performances: Now Hear This

Join violinist Scott Yoo for "Great Performances: Now Hear This," on Fridays at 8 p.m. The 4-part miniseries merges music, storytelling, travel and culture, as he chases the secret histories of some of the greatest music ever written.

Ken Burns presents ‘Country Music’

The new documentary premieres Sunday, Sept. 15, through Wednesday, Sept. 18, and Sunday, Sept. 22, through Wednesday, Sept. 25, at 7 p.m. each night