Moore's law
Gordon Moore's 1965 observation: the number of transistors per chip doubles roughly every two years. Driving myth of the semiconductor industry for 60 years.
Originally "every year" (1965), revised to "every two years" (1975). Not a law of physics — self-fulfilling prophecy (ITRS roadmap, now IRDS). Decline noted since ~2015 by several (Krzanich, Huang). Modern reality: transistor density still grows but performance + watt no longer scales per Dennard. Pivot to chiplets, 3D stacking, specialised accelerators.