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Behind the bleeding edge MANKINDS progress in developing new gizmos is often referred to as the march of technology . That conjures up images of constant and relentless forward movement orchestrated with military precision. In reality, technological progress is rather less orderly. Some technologies do indeed improve at such a predictable pace that they obey simple formulae such as Moores law, which acts as a battle plan for the semiconductor industry. Other technologies proceed by painful lurches-think of third generation mobile phones, or new versions of Microsoft Windows. And there are some cases, particularly in the developing world, when technological progress takes the form of a leapfrog. Such leapfrogging involves adopting a new technology directly, and skipping over the earlier, inferior versions of it that came before. By far the best known example is that of mobile phones in the developing world. Fixed line networks are poor or non existent in many developing countries, so people have leapfrogged straight to mobile phones instead. The number of mobile phones now far outstrips the number of fixed line telephones in China, India and sub Saharan Africa. There are other examples. Incandescent light bulbs, introduced in the late 1870s, are slowly being displaced in the developed world by more energy efficient lightemitting diodes , in applications from traffic lights to domestic lighting. LEDs could, however, have an even greater impact in parts of the developing world that lack mains power and electric lighting altogether. LEDs greater energy efficiency makes it possible to run them from batteries charged by solar panels during the day. | 
