Also in this episode:

Catalyst: Racing against infectious diseases

Catalyst: inclusion and exclusion bias

Catalyst: Recycled asphalt

In this segment:

Rob Gray, Ph.D. associate professor and program chair, Human Systems Engineering

Catalyst: Recycled asphalt
Catalyst: Closer look at asteroid Bennu
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'Austin City Limits' spotlights country artists

Explore the best original music in uninterrupted full concerts recorded live in Austin, Texas.

Swedish crime thriller 'Modus' comes to Arizona PBS

Ex-FBI profiler Inger Johanne Vik is drawn into investigating a series of brutal murders in Stockholm after her daughter becomes an unwitting witness to a murder.

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