The Druid String and Black Diamond Biking

Dropped Ikm over 15km, the bike became skiis as we flew down the switchback turns. In the valley was a Templar castle built with a piece of string. The ´Druid String´has thirteen knots each equidistant apart and then these are sub-divided into 12 equidistant apart segments, with this basic ruler many geometric problems were solned. It was with this device the Templars built their castles. As I peddle I try and remember long forgottem theorems because I like the idea of going to work with a piece of string in my pocket.