For posterity:

    1. Have attention spans been declining? (slimemoldtimemold.com)
       338 points by janandonly 4 hours ago | flag | hide | 254 comments

    2. Attention Is Off By One (evanmiller.org)
       400 points by elbasti 4 hours ago | flag | hide | 129 comments

Note that the #1 post is probably there because the title earlier had the provacative "Yes, 65%" appended to it. So even more numerical.

"In this post, I prove that attention spans have actually declined by 64%, contrary to widely-publicized reports of 65%..."