PBS Presents

Think Wednesday | Feb. 27, 2019 Preview

Preview | 30s

Join NATURE and explore Yosemite with experts to discover how climate change affects the valley’s majestic beauty. On NOVA, follow our ancestors’ footsteps out of Africa along a trail of fresh scientific clues to help unravel the mystery of how we got where we are.

Aired: 02/27/19

Rating: NR

Video has closed captioning.

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