Business Week writes in an investigative cover story: " The growing ranks of businesspeople worried about click fraud typically have no complaint about versions of their ads that appear on actual Google or Yahoo Web pages, often next to search results. The trouble arises when the Internet giants boost their profits by recycling ads to millions of other sites, ranging from the familiar, such as cnn.com, to dummy Web addresses like insurance1472.com, which display lists of ads and little if anything else. When somebody clicks on these recycled ads, marketers such as MostChoice get billed, sometimes even if the clicks appear to come from Mongolia. Google or Yahoo then share the revenue with a daisy chain of Web site hosts and operators. A penny or so even trickles down to the lowly clickers. That means Google and Yahoo at times passively profit from click fraud and, in theory, have an incentive to tolerate it. So do smaller search engines and marketing networks that similarly recycle ads."

The Economist writes:

Worldwide about 20% of all electricity generated is used for lighting. Several studies reckon that LEDs could eventually cut that amount in half. That would not only save billions of dollars in electricity bills, but also significantly reduce energy demand, environmental pollution and greenhouse-gas emissions.

Besides being environmentally friendly, LEDs allow unprecedented control over lighting. Unlike incandescent or fluorescent lamps, which spew light in all directions, LEDs generate directional light, making them ideal for selectively illuminating areas. Moreover, the ability to mix and match the output of red, green and blue LEDs makes it possible to “tune” the emitted light to produce any desired colour. Lighting designers are already using LEDs to illuminate monuments, restaurants and even famous paintings, such as Leonardo da Vinci's “Mona Lisa”. Because LEDs emit monochromatic light, any potentially harmful or unwanted radiation, such as ultraviolet or infra-red light, can be eliminated.