One thing about scientists is sure, we all love to argu^H^H^H^H discuss. That is definitely a positive thing and allows careful consideration of the various points of view of a topic that may not be obvious to everyone, so rock on!
As far as this menu issue goes, there have been some good points made about organization and classification schemes. However I think the real point of this discussion is how should a menu be organized to facilitate easy and logical navigation to an app. That said, I think we should not overly subdivide. If the menu depth gets too large, we will be spending more time clicking menu levels than scanning a menu list for the app name. For example in my experience, I may have a couple of astronomy apps, but rarely 50 installed on any one system. I doubt many users will want to click Apps -> Science -> Astronomy -> Cosmology to get a list containing 1 cosmology program that is installed. Same for other fields of science. How many of us actually have more than 5-10 apps installed for a given field? Also, to avoid some of the confusion about Education vs Science, would it make sense to replace "Education" with "Teaching" and use that category for quiz tools, etc? Cheers, JDR