The ESP32 never ceases to impress me. They're ridiculously cheap and low power, and the fact that they're able to emulate a PC operating system just makes them even cooler.
It's one thing to say that there's more computing power in a coffee maker than would fit in a desk 40 years ago - but to actually demonstrate it is mind blowing.<p>Even a run of the mill smart phone can out compute IBM's Deep Blue's 12GFlop from 1997.