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Gulo Blue
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It measures temperature and reports it as a series of light pulses. People debate what the minimum functionality has to be to call something a computer, but IBM built something with similar functionality (but much bigger) and called it a computer. Here it is next to a grain of rice:
http://www.businessinsider.com/worl...o-tiny-it-makes-a-rice-grain-look-huge-2018-6
http://www.businessinsider.com/worl...o-tiny-it-makes-a-rice-grain-look-huge-2018-6