In this segment:

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

Sign up to receive the Arizona PBS Insider

Get up-to-the-minute information about your favorite programs and learn more about Arizona PBS news and events.

179 history documentaries you can watch right now (no membership required)

Have you decided that it’s high time to take a step back and look at the big picture? Whatever your motivation, we’ve got you covered.

'Nova' delivers stories from the front lines of science

"Nova" explores new discoveries and how we have come this far on Wednesdays at 8 p.m. on Arizona PBS.

Learn more 'Secrets of the Dead' this summer

Explore some iconic historical moments while debunking long-held myths and shining new light on past events. Advances in investigative techniques, forensic science and historical scholarship offer new evidence on forgotten mysteries.