How Everything Is Made on Instagram: "Before silicon chips existed, NASA relied on magnetic core memory to run the Apollo Program. These computers used hand-woven grids of tiny magnetic rings, called cores. Each ring stored a single bit of data by flipping its magnetic direction, and once set, it held that information with zero power. This made core memory incredibly durable and reliable—perfect for spaceflight. It’s also where the term “core dump” comes from, originally referring to reading out