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Content: This is Part One in a series on objective reality. The classic double-slit experiment reveals the wave-particle dual nature of particles like electrons and photons. The question has many levels. In quantum physics, we know that the observer effectcollapses wave functions into particles. The double slit experimentshows that a single photon can act as both a wave and a particle. A single electron fired at a double slit appears to interfere with itself and act like a wave. At around the 4:00 minute mark of the linked video, we see what happens when we try to observe which slit the electron passes through. When we do that, the electron stops acting like a wave and the interference pattern is replaced by a simple double distribution pattern. Another famous conjecture is Schrodinger’s Cat, where a cat is placed in a box with a flask of poison and a radioactive atom. A detector tells when the single atom splits, an event with quantum indeterminacy.