All interesting answers!

I have a feeling I may end up googling some of these things myself.
I apparently didn't learn how to proofread myself all the time, judging by my first post.
racoonangel, you made me relearn what a "courbe de niveau" was. I knew what it was, but had forgotten how it was called.
Speaking of relearning, it's the same for me, Strange Wings. Judging by the graphics in my flashcards program, I have to relearn every day just about as many words as the number of new words I'm including. Sometimes it's a little bit discouraging to find out I have forgotten words that were easy a few months ago. :d oh: But the graphics also shows that I remember a good proportion of the words I revise.
I haven't learned any completely new word today, only going in the reverse direction of words I already knew, but I memorized 5 sentences which included new grammar.
I also learned a few things over economics theories, thanks to various news media.