Another good idea to save electricity: [streetlights that dim when the moon is full](http://gizmodo.com/gadgets/bright-ideas/lunar+resonant-streetlights-only-shine-when-the-moon-doesnt-288332.php).
// Quickhit
Another good idea to save electricity: [streetlights that dim when the moon is full](http://gizmodo.com/gadgets/bright-ideas/lunar+resonant-streetlights-only-shine-when-the-moon-doesnt-288332.php).