I know my old blogs in the past 15 years are still being read. However because of the 48 hour limit on comments for blog articles, readers cannot add comments to those articles. Thus, I wsih to add that if new readers of these old articles still wish to comment, you can just write to me via my e-mail (ho@seas.harvard.edu), I promise I'll answer. And if there were enough comments, I'll publish them in a new blog article for all to see. This way, the editors of sciencenet need not check the millions of past articles everyday to make sure no red lines are crossed. New readers can still vent their feeling about any articles I have written in the past 15 years.