Students build working version of Leonardo da Vinci's self-supporting bridge

It reminds me of this…

http://www.queens.cam.ac.uk/life-at-queens/about-the-college/college-facts/mathematical-bridge

All mam arter, gaudy armours iggy tour…

It is based on a Chinese design, and there is a bigger one in China in stone that is much older. But this is the one I know.

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