By the way, our windows don't open up and down but out to the sides.  They are also heavy double paned with metal frames.  For an accident prone person such as myself, this is not a good thing.  I can't count the number of times I've almost knocked myself out standing up quickly from vacuuming or picking something up off the floor and banging my head on the underside of an open window.  Today I may or may not have broken my nose and will, at the very least, have a bruise.  don't ask...  xxoo me