I may be reading this incorrectly, but in the article, the 65% appears to be authors confidence in the statement that attention spans appear to be declining, as denoted by the sub-script. Whereas in the HN title it reads as if it's saying a "65% decline in attention span". Various other assertions in the post also have sub-script confidences associated e.g. "my guess: yes90%". I could totally believe that there has b…
> It seems likely to me that individual attention spans have declined (I’d give it ~70%), but I wouldn’t be surprised if the decline was relatively small, noisy & dependent on specific tests.