Bruggen van Leonardo da vinci
Bruggen van Leonardo da vinci
http://www.scholieren.com/werkstukken/21717
Hoe het Werkt (engels)
Bridges support tremendous weight, span huge distances and all the while withstand the greatest forces of nature. find out about these engineering feats (as well as some of the flaws).
http://www.howstuffworks.com/bridge.htm