I've been playing with an expansion of the Cat thought exercise and how it relates to the many worlds theory. If we replace the Cat in the Box with ourselves, at what point does Quantum decoherence take place? Are we as the subject of the test a sufficaint observer to collaps the superposition or is an "Outside the Box" observation required If we accept Quantum Decoherence wouldn't this lead us to Immortality? as every superposition collpses, two possibe outcomes are created, if we repeated the box test to ∞, an ∞ number of worlds would be created, half of which would contain our death and half which would contain our survival. Since our perception would only be aware of the survival we would percieve only our contimued existence. infact an ifininate number of ourselves would have to survive split off at every point of Quantum Decoherence created as every superposition is created and collapsed?. How does this effect the Many Worlds theory and Quantum Decoherence?