In philosophy, physicalism is the idea that everything can be explained in physical terms. Whether through atoms, electrons, quarks, fields, or other physical processes, physicalism holds that every phenomenon ultimately depends on the physical world. In the philosophy of mind, this means that everything about the mind can, in principle, be explained by the physical processes of the brain. We don't yet know all the details, but physicalism maintains that a complete explanation is possible.
In the most talked-about film from the final year of the 20th century, " The Matrix," a computer hacker named Neo finds that the world he lives and works in isn't real. It's a virtual reality, created by artificial intelligence. At the time, the idea seemed like science fiction. In the years since, however, that concept has become an increasingly credible theory: " the simulation hypothesis."