Water is Life — The Drinkable Book, a life-saving tool that has two important functions. Not only does it educate people in the developing world about the importance of clean drinking water, it also filters water itself, killing of bacteria.
Would an Hourglass Traffic Light Work Better? Mark Frauenfelder found this interesting new traffic light design by Thanva Tivawong. LED lights trickle down like sand in a virtual hourglass, letting you know when the light will change.