the best approach is to run according to your mood and how you feel on that given day. to make thing more complicated, every company will charge you differently depending on these criteria. we feel as though we are living in a cabin in the mountains when we look out our windows. the technology has let me down. overall, this book was fun and fast moving. to wash fragile objects, place them on a towel covered tray and place in sink.spray them with window cleaner, then with water. what does it have to do with you? 