Computer researchers have recently found out that the main chip in most modern computers—the CPU—has a hardware bug. It’s really a design flaw in the hardware that has been there for years. This is a big deal because it affects millions of computers including workstations and servers. Meltdown, and another related bug known as Spectre, exist in every Intel CPU manufactured between 1995 and late 2017. It also affects a limited number of ARM processors. The bug could be present in over 75% of CPUs in operation.