Quantum Reality — does mass exist? Ever since the 1960s Double Slit Experiment, reality has not been the same The writer is a geopolitical analyst. She also writes at globaltab.net and tweets @AneelaShahzad Ever since the 1960s Double Slit Experiment (DSE), reality has not been the same. The fact that single electrons shot through a setting of two slits, accumulatively made a wave-pattern on the screen, but when a beam of detector light was put across the slits, the wave function of the electrons collapsed and they behaved as particles again — has led to two conclusions, one that particles have a dual particle/wave behaviour, and the other that electrons or quantum particles change their behaviour when they find an observer/detector in their settings.