These Ancient Stones Helped Track the Seasons
Season 50
Episode 2
About the Episode
Along the river Gambia in Senegal, there are more than a thousand stone circles. The people who placed these stones would have observed how the locations of sunrise and sunset varied over the year.
Aired:
| Expires: | Runtime: 2m 57s
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Extras
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One of the Greatest Meetings of the Minds in History
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The “Hippy Days” of Quantum Physics
How a group of free-thinking physicists in the 1970s helped shape quantum physics.1:43 -
How Large Language Models Like ChatGPT Work
It’s not always easy to tell the difference between writing by a human and ChatGPT.1:44 -
Inside the Fight To Develop a Malaria Vaccine
These scientists were on the verge of a breakthrough with a promising vaccine nearing approval.4:18 -
Campi Flegrei: Italy’s Underground Super Volcano
In Italy hundreds of thousands of people are living directly on top of an active volcano.3:43 -
Is the Human Brain Actually Two Minds?
Severing the connection between the two halves of the brain reveals how the hemispheres function.5:17 -
Is Pain Made in the Brain?
This experiment shows how the brain can interpret — and misinterpret— pain.3:40 -
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 -
