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I would say that Nagai Nagayoshi was in Tokyo in 1893 when he became the first person to create methamphetamine; however, although the date is well known, the location is not absolutely clear. See the following, for example: https://www.theatlantic.com/technology/archive/2014/10/brewing-bad-the-all-natural-origins-of-meth/381045/ --NoToleranceForIntolerance (talk) 09:37, 14 January 2018 (UTC)[reply]