Allen Grossman has been doing things with tears for decades. "Stars are tears falling with light inside," begins the title poem ofThe Woman on the Bridge over the Chicago River (1979). The moon is a ...
If you need to measure a distance, it is tempting to reach for the ubiquitous ultrasonic module like an HC-SR04. These work well, and they are reasonably easy to use. However, they aren’t without ...
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