English: Suspension bridges are suspended from cables. The earliest suspension bridges were made of ropes or vines covered with pieces of bamboo. In this picture the suspension bridge, which is now only for human use, is in Astore Valley. This type of bridge is found in the Gilgit-Baltistan area of Pakistan. (Photo credit: Wikipedia)
is a great article about a new innovation. Using huge plastic tubes filled with concrete to quickly and cost-efficiently build new bridges. Worth reading to appreciate the ingenious idea.
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