China bridge
Category: Science>Technology>Structural Engineering>bridge>History
Discover how China's Song dynasty during the eleventh and twelfth centuries used the high arch "rainbowbridge" to solve the problem of spanning a fast-moving river without impeding boat traffic. Nova online.
http://www.pbs.org/wgbh/nova/lostempires/china/ ReviewsRating: Not yet Rated Whois Check