Previously, when building a search in PubMed using History on the Advanced Search page, users would choose the search numbers they wanted to combine by clicking the item (#1, #22, etc.) and that is what we would see in the search builder; numbers, not words. Now, when you combine previously run searches, the actual terms appear in the search builder. No more wondering what those numbers represent.
Here’s a quick video to demonstrate: http://www.screencast.com/t/3kbYUXhNxX