Science teacher on Instagram: "Making a CPU is one of the most complex manufacturing feats in human history. It involves transforming ordinary sand into a thumb-sized chip containing billions of microscopic switches called transistors. ​The process happens in "Clean Rooms"—environments thousands of times cleaner than a hospital operating room—because even a single speck of dust can ruin a processor. ​1. From Sand to Silicon ​The journey starts with silica sand. Silicon is a semiconductor, meanin