I'm talking about the devices that built from a micro component, such as our microprocessor. It's small, just app 3 inches wide at most, isn't it? But yet inside it resides MILLION (oh no, BILLION) of transistor, resistor, and something like that. And for that tiny little thing, we are willing to pay a lot of money, because without it, our computer won't run like today.
So, what the smallest yet powerful device you have ever known until today?