Do you have a Photo graphic memory or something?
I think I have a pretty good memory but, as I have noted before, it is largely the use of the forum's Advanced search feature that leads me to posts, including those that are several years old. Over the course of the years, I have used the forum's Advanced search feature thousands of times, usually several times a day, so I feel that I have learned how to use the feature most effectively. Also, as a Moderator, I try to read or at least scan all the new posts (we have days where they number over a hundred posts) to be sure that they are filed in the right places, so this exposes me to the content more than others who are more selective in their reading. I am more likely to cite my own posts because I know how I think and articulate things, plus I have posted on so many topics, sometimes more than once, as the same topics keep coming up over and over again, especially from new members. In the case of the string question you posed, I used the keywords butcher's, string, and dental floss under my forum's user's name. Those are terms that I recalled using in my posts on that topic. I try as much as possible to use the longest string of keywords possible to keep from getting hundreds of posts to sort through.
I have discussed how to use the forum's Advanced search feature at http://www.pizzamaking.com/forum/index.php/topic,3101.0.html
. It is one of the sticky threads under Forum Info.