What is the difference that makes a difference? In philosophy, the difficulty of explaining why somebody can feel anything is often referred to as the Hard Problem. The term was coined by the philosopher David Chalmers. He made his reputation in the early 1990s by a closely argued chain of reasoning, leading him to conclude that conscious experience does not follow from the physical laws that rule the universe. These laws are equally compatible with a world without consciousness or with a different form of consciousness. There will never be a reductionist, mechanistic account of how the
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