This calendar view maps the number of times http://www.skepticalscience.com/2015-SkS-Weekly-News-Roundup_35.html was crawled by the Wayback Machine, not how many times the site was actually updated.
This calendar view maps the number of times http://www.skepticalscience.com/argument.php?p=10&t=514&&a=18 was crawled by the Wayback Machine, not how many times the site was actually updated.