The shadow gap technique has been expanded and developed on minimalist staircase. An amazing effect is  created by letting the light through the gaps between the wall and the stairs. More such designs at lightiq.
The prize this week is a jet lighter, just what you need when you are starting that campfire with damp wood. This contest will run for the rest of the year (December 27 – 31, 2011). Ending time is based on central standard time. To enter, identify the item above and what it can be used for. Please do not give the answer in the comments. Send an email
CdS (Cadmium Sulfide) photo-resistors are fairly cheap and widely used light detectors. Since CdS cells contains Cadmium, a toxic heavy metal, has now become hard to find. The reason is because of the RoHS directive. Electronics-lab has reported an excellent alternative for CdS that is more versatile and cost-effective. The idea is that when you are building a micro-controller based circuit such as a PIC or Arduino, then you can use a simple LED
