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The rise and fall of the Maya Empire’s most powerful city - Geoffrey E. Braswell
Trace the rise and fall of the Maya city Chichen Itza, and how Yucatán’s unpredictable environment contributed to its demise.
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During the 8th century CE, warfare and failing agriculture forced Maya people to move north, to hotter, drier Yucatán. Because of its freshwater access, Chichen Itza became the most powerful Maya city, with nearly 50,000 citizens at its height. But the region presented its own challenges and the city's golden age wouldn’t last forever. Geoffrey E. Braswell traces the city's rise and fall.
Lesson by Geoffrey E. Braswell, directed by Hernando Bahamon, Globizco Studios.
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Does math have a major flaw? - Jacqueline Doan and Alex Kazachek
Practice more problem-solving at https://brilliant.org/teded
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A mathematician with a knife and ball begins slicing and distributing the ball into an infinite number of boxes. She then recombines the parts into five precise sections. Moving and rotating these sections around, she recombines them to form two identical, flawless, and complete copies of the original ball. How is this possible? Jacqueline Doan and Alex Kazachek explore the Banach-Tarski paradox.
Lesson by Jacqueline Doan and Alex Kazachek, directed by Mads Lundgård.
This video made possible in collaboration with Brilliant
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View full lesson: https://ed.ted.com/lessons/does-math-have-a-major-flaw-jacqueline-doan-and-alex-kazachek
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Picture a perfect society. What does it look like? - Joseph Lacey
Dig into political philosopher John Rawls’ classic thought experiment about what principles we need to design a fair society.
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A group of strangers have gathered to design a just society. To ensure none of them rig the system, they’ve been placed under a veil of ignorance. Under this veil, they’re blind to information about age, sex, profession, wealth, religion, and so on. Can they build a fair society where everyone has the resources they need? Joseph Lacey details John Rawls' classic thought experiment.
Lesson by Joseph Lacey, directed by Eoin Duffy.
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View full lesson: https://ed.ted.com/lessons/3-easy-steps-to-build-a-real-utopia-joseph-lacey
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The Nazis recruited to win the Cold War - Brian Crim
Dig into Operation Paperclip, a secret intelligence program which brought scientists from Nazi Germany to the US after WWII.
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In May of 1945 the Third Reich was in chaos. Adolf Hitler was dead and German surrender was imminent. But while World War II was almost over, a new war was brewing. And the US was eager to recruit the smartest minds in Germany before the Soviets got the chance— regardless of their affiliation with the Nazis. This became known as Operation Paperclip. Brian Crim digs into the clandestine campaign.
Lesson by Brian Crim, directed by Jeff Le Bars, JetPropulsion.space.
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View full lesson: https://ed.ted.com/lessons/the-program-that-brought-nazis-to-america-brian-crim
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