Thanks, Lev! tho i'm sorry to say i dont precisely understand what you're saying to me in this comment, simply that both subject matters as well as content for what you teach has evolved and changed thru the years - at least that's my inference (correct or erroneous). Hope you had a (or are having) a beautiful weekend. It's still Sunday morning for another hour or 2 here in Minneapolis. If you pray, please add a prayer for the U.S. eastern seaboard, which is getting pounded by water again. *insert here the correct witty saying in French to describe climate change and global warming* maybe it's just C'est la Vie. Hope you have a good upcoming work week. Hugs from 1/2 a world away to you and yours.
john