27th
The Dictionary application received a number of improvements with the release of OS X 10.5. First of all, there’s a new technical jargon dictionary from Apple, and direct access to Wikipedia entries as well. There’s also a huge resource known as “front and back matter,” which you can reach by selecting Go -> Front/Back Matter -> New Oxford American Dictionary from Dictionary’s menu. In the front/back matter, you’ll find things such as a list of all US presidents, a chemical elements chart, standard weights and measures, countries of the world, and much more. If you haven’t checked it out yet, it’s quite impressive in its breadth.
