Sensor that detects rain could sense rain when parked and auto close windows if they are "vented"... At minimum if push alerts are set it could send a message to the user that asks "close windows?" when rain is detected... I frequently use the vent option for the windows in my car (live near atlanta) however I don't always see that it is raining until it is too late. I believe the hardware is all installed, just a little code that needs written.
Idea No. 731