Originally Posted by dcl

The following responds to the entries that asked questions that I can answer:

dcl: Particle-wave duality is real. The same entity under appropriate conditions can be manifested as either a wave or a particle, but not both simultaneously. It's the circumstances that detemine whether the enteity is manifested as a wave packet or as a particle. We have no way of knowing what the entity really is. When light passes through an optical instrument, it behaves like a wave. When the same light falls on a photoelectric cell, it behaves like a stream of particles.