Tonight at 8:00pm on WETA PBS, or stream with the free PBS Video App.

Nature: A Spy in the Wild

Meet the Spies: The final episode explains how the concept of the Spy Creatures evolved from the original BoulderCam to the PenguinCams that inspired the next-generation "spycams" featured in this series.

Tonight at 9:00pm on WETA PBS, or stream with the free PBS Video App.

Making North America

Origins: From palm trees that once flourished in Alaska to huge eruptions that nearly tore the Midwest in two, NOVA discovers how forces of almost unimaginable power gave birth to North America.

Tonight at 10:00pm on WETA PBS, or stream with the free PBS Video App.

Secrets of the Dead: Egypt's Darkest Hour

Follow archaeologists examining a rare mass grave from the collapse of ancient Egypt's Old Kingdom.

Tonight at 9:00pm on WETA World, or stream with the free PBS Video App.

Cooked: Survival by Zip Code

Learn the story of a heat wave that overtook Chicago in July 1995, killing 739 residents, most of them poor, elderly and African American. The heat wave revealed a long-term crisis of poverty, racism, and economic and social isolation in the city.

Telly Visions: The Podcast

Episode 27: The ladies do a deep dive into the world of online streaming — where to find your British faves, what services you need to stream them, and our recs for what you can't live without.