Sympathy! I guess I'm not the only person who nurses things until the whole tray dies.
That answers my question about how WS could work once the sun came out from behind the clouds. It always seemed to me that they would cook before I got home from work to rescue them.
I guess they do!
My first thought was micro-computer-controlled, motorized vents and sun-shade blinds with thermostats and alarms wired to send me text messages by cell phone.
My second thought was something vague about afternoon shade.