haha, i know this situation well, vacant. when i get home from work, i usually only have 3 hours till i have to go to bed, so most often, kitchen/dinner table = lecture hall... if i had more patience & time to relax i would just write everything down (as my girlfriend suggested two nights ago, "OMG GET A NOTEBOOK") but it's so much more interesting/productive/satisfying? when someone else is contributing ideas!
downside is, of course, all this energy gets bottled up for hours while i'm at work; i don't really talk to anyone because i have a hard time answering questions without some kind of technical explanation (although i'm the IT guy & nobody expects to understand me anyway i guess?)...
but hey, leonardo da vinci said it: "the knowledge of all things is possible." haha... much easier/more practical (i think) to understand the reason behind the facts than to simply memorize all the facts, no?