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: 02/27/19Video has closed captioning.