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We describe the road which led to the construction and exploitation ofelectron positron colliders, hightlighting how the young physics student BrunoTouschek met the Norwegian engineer Rolf Wideroe in Germany, during WWII, andcollaborated in building the 15 MeV betatron, a secret project directed byWideroe and financed by the Ministry of Aviation of the Reich. This is howBruno Touschek learnt the science of making particle accelerators and wasready, many years later, to propose and build AdA, the first electron positroncollider, in Frascati, Italy, in 1960. We shall then see how AdA was broughtfrom Frascati to Orsay, in France. Taking advantage of the Orsay LinearAccelerator as injector, the Franco-Italian team was able to prove thatcollisions had taken place, opening the way to the use of particle colliders asa mean to explore high energy physics.

The path to high-energy electron-positron colliders: from Wideroe's betatron to Touschek's AdA and to LEP