[723] Seismic Waves
Title Text:The USGS operates a really neat email/SMS earthquake notification service (earthquake.usgs.gov/ens/) that allows fine-grained control of notifications. Origin:https://xkcd.com/723/ https://www.explainxkcd.com/wiki/index.php/723:_Seismic_Waves 网络时代的地震预警 根据惠更斯-菲涅尔原理,(帖子)波前上的每一点都可看作新的次(帖子)波源…… https://songshuhui.net/archives/48993 围绕Twitter用户的一个刻板印象是,他们更关心的是广播他们当… Read more
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