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PBS Presents | Promotion | Think Wednesday | Feb. 27, 2019 Preview

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.

0:00:30 | AIRED: 2/27/2019 |
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