That blog post doesn&#x27;t really say anything.  You have to click through a couple of links to find the real paper: <a href="https:&#x2F;&#x2F;static.googleusercontent.com&#x2F;media&#x2F;research.google.com&#x2F;en&#x2F;&#x2F;pubs&#x2F;archive&#x2F;44830.pdf" rel="nofollow">https:&#x2F;&#x2F;static.googleusercontent.com&#x2F;media&#x2F;research.google.c...</a> which has some interesting ideas, although it&#x27;s a bit too brief for the subject, I think.