Petra: Lost City of Stone Preview
Season 42
Episode 5
About the Episode
How did early engineers carve tombs into rock cliffs and funnel water to this desert city? Airing February 18, 2015 at 9 pm on PBS
Aired:
| Expires: | Runtime: 30s
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Extras
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A Hidden Cause of Sinkholes Is Lurking Underground
About 40% of the U.S. is susceptible to sinkholes.2:21 -
The Mysterious Illness That Befell Eiffel Tower Construction Workers
Building the massive Eiffel tower on the bank of the Seine River posed more than one challenge.2:50 -
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The Birth of Artificial Intelligence
The origins of modern AI can be traced back to World War II.3:24 -
How Did Whales Evolve From Land Mammals?
The story of whales’ evolution from land mammals is hidden in their genes.3:08 -
Are Your Online Passwords as Safe as You Think?
Your dog's name, birthday, and zip code do not make secure passwords.2:22 -
The Deepest Underground Lab in the U.S.
A team of researchers hunt for dark matter deep underground in the Black Hills of South Dakota.1:44 -
Inside the Construction of the Statue of Liberty
The Statue of Liberty was one of the most innovative engineering feats of it’s time.2:59 -
How Vera Rubin broke barriers in astronomy
Vera Rubin's work provided convincing evidence for a mysterious substance, dark matter.4:04 -
What Dating Apps Know About You
You might be collecting matches, but dating apps are collecting your data.2:51
