In terms of electronics
We got really good at making precise silicon structures. In the macroscopic world we talk about resistors and transistors and capacitors but in the microscopic world it’s just a few strips on metal shaped ‘weirdly’ with the blackest of magic semiconductors inbetween.
We have managed to precisely remove chunks of silicon specifically filled with post transitional metals to change the electrical characteristics in specific ways.
We have managed to make a single atom function as a transistor. That is only done from hardwork, incredible research, and someone(s) crazy enough to try
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