We have neighbours who we don't know very well who DH suspects are Jehovah's Witnesses. We noticed they leave their front door open all day when home until sunset. I am really intrigued if this is a religious thing and what it means or why it is done? They seem very nice but I am an introverted person and not the type to just go up to someone and ask why, but I am so intrigued by this (or perhaps just nosey!)