Man goes on studying and refining the technology used in the production of electricity from the wind, and the aim is to exploit its power more and more. This unusual wind generator is called “blender” because of the peculiar shape of the vanes. It is a “vertical axis” wind generator, that is, the rotating axis of the generator is in a vertical position in relation to the earth. The picture was taken in California, in February 1986. (picture copyright CORBIS)