I'm currently reading "The Dream Machine" [1], about the first evolutions of computing. At the moment it's describing the period during and immediately after the Second World War, with computers like ENIAC. It blows my mind that in the space of around 20 years, we progressed from computers that were programmed by turning shafts and ran computations using systems of wheels and mechanical relays [2] to the Lunar Module Guidance Computer with its pre-emptive multitasking and automatic pilot.
Sometimes the rate of technological advance is just staggering.
[1] https://www.amazon.com/Dream-Machine-Licklider-Revolution-Co...