It's hard to navigate this site and to find what I'm looking for.

You could have a topic search box for topics we already know of.

You could have drop-down menus to explore topics.*⁶⁷¹³

You have levels of topics arranged as follows:

QDL / Articles / Science / Theoretical / Introduction / Moderator's Workbench / Discussions / Problems

You could allow drop-down menus to appear under any topic that we hover our cursor arrow over.

It's better to have them drop down just by hovering the arrow over a topic, rather than clicking on the topic

And when a menu drops down, it would be good to be able to move the arrow down over the list of subtopics and to have submenus appear as we hover over each subtopic. And ditto for sub-subtopics etc.