I can't think of any specific topic off the top of my head, but I know there have been a number of times when I've performed searches and haven't been able to find what I need to know. One thing I've noticed with the keyword search is that it will bring up every thread that happens to mention those particular words. So if you're looking for info on your dizzy, it will bring up every single thread that happens to have the word dizzy in it, even if 90% of those threads are about carbs because one person mentioned dizzy.
Plus, we all know that we don't always title our threads in relevence to what we need to know, so you end up searching thru dozens of threads, none of which have any info you need, and finally you decide that it's just easier to post a new one.
Of course, it's completely understandable when you end up with nearly the exact same threads on the same page, so mebbe we should search the last few pages before posting.
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I can't think of any specific topic off the top of my head, but I know there have been a number of times.....