I recently been reading up quantum physics including the double-slit experiments and I got two basic questions: 1# Why does the electron not act like a wave when there is only one slit? Shouldn't a single slit still result in a wave like pattern? 2# 'Measuring' the wave seems to turn it into a particle. Even if this is done after the slits. Yet some scientist are calling this potential time travel. How do they know its not simple a wave that instantly turns into a particle at the point of 'measurement' without any 'time travel'?