Thanks for the article, it's very interesting. One thing I noticed though is that the data points you have fitted your mathematical model to ignore Usain Bolt's achievements. According to your blue line, the world record is still 9.79 seconds. If you include Usain Bolt's marks of 9.69 followed by 9.58 (as well as some other intermediate marks by Asafa Powell I think), which have all been recorded still less than 100 years after 1912 along your x axis, then I think your model fit would be much less impressive, so if you added the latest data points and re-fitted a logistic curve the model would end up suggesting a maximum possible time of something lower (possibly around 9.40 seconds...)
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