Burning garbage is not a new idea. Some cities in Europe and the United States have been burning garbage for years.
By 1860, most of the machinery in use today had been designed in an early form.
The advantages and disadvantages of a large population have long been a subject of discussion among economis.
By the year 2050, experts believe that the problems to explore the food, minerals and energy resources of the sea will have been largely solved.
Experiments have shown that colors, partly because of their psychological associations, also have a direct psychological effect.
So far the research has suggested that only the emotional effects of memories may be reduced, not that the memories are erased.
Indian energy officials have been seeking ways to use less imported oil to provide energy.
Much unfriendly feeling towards computers has been based on the fear of widespread unemployment resulting from their introduction.