Thank you for reminding me of that paper&#x27;s title. Jacobian mentioned it to me at PyCaribbean, but I&#x27;ve since been hunting for it.<p>It is available for free at <a href="https:&#x2F;&#x2F;graphics8.nytimes.com&#x2F;images&#x2F;blogs&#x2F;freakonomics&#x2F;pdf&#x2F;DeliberatePractice(PsychologicalReview).pdf" rel="nofollow">https:&#x2F;&#x2F;graphics8.nytimes.com&#x2F;images&#x2F;blogs&#x2F;freakonomics&#x2F;pdf&#x2F;...</a>