I deliberately didn't comment on the second half of your post because there are a few expressions I have to look up first and didn't get around to yet (the usual last week before holidays chaos at work, Christmas party at office, last minute cookie baking and suitcase packing - I'll drive to my parents on Sunday noon. Plus my dictionary weighs 8 lbs...). I'll look them all up tonight and then try to say something halfways intelligent. Promise! ETA: sorry that I gave you an overkill with botanical and zoological names in that other post (re: Si use in terrestrial life). Being a biologist, I have a pretty unfair advantage of you in that field.