When I studied physics in college, the double-slit experiment completely changed how I see reality. Watching a single electron behave like both a particle and a wave depending on whether we measure it raises a profound question: is objective reality actually independent of observation, or is the act of measurement somehow shaping what we call the physical world? Quantum mechanics works incredibly well mathematically, but physicists still debate what it means for our understanding of existence. Some interpretations, like Copenhagen, suggest observation collapses possibilities, while others, like many-worlds, propose every outcome happens in branching realities. Neither has been proven wrong, and the choice between them feels more philosophical than empirical right now. I remember asking my professor whether the moon is really there when nobody looks, and he just smiled and said that's the question. If reality depends on observers, then what happens to the universe before any conscious life existed, or in regions far beyond any measurement device? I'm curious how others reconcile quantum theory with common sense intuitions about an objective world.