Construction Secrets of the Original Great Wall
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The first Great Wall was built from mud and reeds over 2,000 years ago. As warfare developed, the wall had to be improved and strengthened.
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http://www.sciencechannelgo.com
The first Great Wall was built from mud and reeds over 2,000 years ago. As warfare developed, the wall had to be improved and strengthened.
Watch full episodes of your favorite Science shows:
http://www.sciencechannelgo.com
Subscribe to Science Channel:
http://bit.ly/SubscribeScience
Follow Science Twitter:
https://twitter.com/ScienceChannel
Or join us on Facebook:
https://www.facebook.com/ScienceChannel
Check out the all new seeeker.com:
http://www.seeker.com/
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