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PBS Presents | Promotion | Think Wednesday | May 22, 2019 Preview

Travel around the world with NATURE to uncover the history of mankind’s relationship with the horse. On NOVA, bioarchaeologists investigate a ninth-century mass grave thought to hold a lost Viking army. Breakthrough: The Ideas That Changed the World continues as we dial in to the story of how Alexander Graham Bell’s invention became the smartphone as we know it.

0:00:30 | AIRED: 5/22/2019 |
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