PBS Presents

Think Wednesday | Next on January 10, 2018

Preview | 30s | Video has closed captioning.

Explore Yosemite Valley, a land forged in wildfire and sculpted by water; the delicate balance of these two elements is essential to the creatures and trees that call this land home. But with climates changing and temperatures rising, the Sierras are under siege. Next, join astrophysicist Janna Levin on a mind-bending journey to the frontiers of black hole research.

Aired: 01/10/18

Rating: NR

Problems Playing Video? | Closed Captioning