Could we be trapped inside a simulated reality, rather than the physical universe we usually assume? It's tantalizing theory, long theorized by philosophers and popularized by the 1999 blockbuster "The Matrix". What if there was a way to find out once and for all if we're living inside a computer? A former NASA physicist named Thomas Campbell has taken it upon himself to do just that. He devised several experiments, as detailed in a 2017 paper published in the journal The International Journal of Quantum Foundation, designed to detect if something is rendering the world around us like a video game.