Every now and then, somebody is amazed at the ever-increasing power of computers to simulate reality. The accuracy of these simulations increases every year, in step with the increase in computing power. This has led some to extrapolate that eventually we will reach the ability to simulate an entire Universe, perhaps even including conscious beings. And if so, what if we’re a simulation ourselves? According to new research, this is, in principle, impossible due to, you guessed it, the most mysterious of phenomena: quantum effects.