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What about nutrition, fitness, and performance enhancing chemicals, legal or otherwise?

I'm not saying Bolt is a User, but I think it's safe to say he's applying every advantage available.

That would be the "structural breaks" idea. The process in the last 80 years that generated the downward trend in times has changed recently due to technology, etc.

He plainly justified an asymptote: "there must be some limit where humans can not run any faster". The exponential has this property and is simple. There also looks to be a good r^2.

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