Wonderful — my pleasure! It really took me some time to get this too. When I first saw the paper reported on, I thought it was just an ‘edge’ effect. I then began to realize that there was more to it, but it was only when attending a lecture by Joshua Miller a couple of months ago that the penny finally dropped: 50/50 is not always 50/50. To me it was like Monty Hall all over again. :-)
I hope you do enjoy some of my other posts (there are well over 100 by now — a new one every Friday, plus occasionally a bit more).