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But Japan also uses books like this. References: "The Past and Present of Units - From Ancient Units to SI Units" by Koizumi Kesakatsu; "The Science of Measurement - 12 Stories about Measurement -" edited by Sakagami Takashi and Goto Takeshi; "The History of Units - Measuring, Weighing, and Weighing" by Ian Whitelaw; "The Evolution of Units - Aiming for Ultimate Precision" by Yasuda Masami; "How Mathematics Has Changed History - From the Construction of the Pyramids to the Quest for Infinity" by Ann Rooney; Why America won't go metric https://edition.cnn.com/2022/06/12/po... Image source: Wikimedia Commons, public domain Irasutoya pixabay The Nippur cubit. Exhibit in the Archeological Museum of , Turkey by Aeroid CC BY-SA 4.0 https://commons.wikimedia.org/wiki/Ca... Imperial Standards of Length, Greenwich by Y.ssk CC BY-SA 4.0 https://en.wikipedia.org/wiki/Yard#/m... One of the historical (18th century), standard-meter (mètre-étalon) by Chalgrin located at 36, rue de Vaugirard in Paris by LPLT CC BY-SA 3.0 https://commons.wikimedia.org/wiki/Ca... Metric standards Rijksmuseum by Yerpo CC BY-SA 4.0 https://commons.wikimedia.org/wiki/Ca... International System Of Units Logo by Randomwangran CC BY-SA 4.0 https://commons.wikimedia.org/wiki/Ca... Tucker Carlson (52586717520) by Gage Skidmore by CC BY-SA 2.0 https://commons.wikimedia.org/wiki/Ca... early 1990's... by contri CC BY-SA 2.0 https://zh.wikipedia.org/wiki/%E5%A4%... Background video pixabay BGM source "Frog's Piano" "Storyteller's Room" shimtone DOVA SYNDROME