Stuff They Don't Want You to Know - Lost Civilizations Part I

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Lost Civilizations: Part I Over the span of human history numerous empires and city-states have collapsed. Often the circumstances of their demise remain mysterious. However, recent research may have shed some light on the collapse of several civilizations. Tune in to learn more. Home: howstuffworks.com Facebook facebook.com Twitter: twitter.com iTunes: itunes.apple.com Playlist: www.youtube.com
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