They hold regular markets wherein they exchange goods. If the grains stored by them get wet due to rains, they take these grains out into the sunlight to dry, and once these are dry, they take them back inside. For the last few centuries explosion of knowledge has been proceeding at an alarming pace. Man has been able to discover many mysteries. Domain of experimentation and observation have widened quite appreciably.
Man stands aghast at the present trend of scientific and technological progress.
Nations have been competing in learning more and more. New tools and methods are devised to acquire more and more information. Despite such a tremendous progress much is left unknown. If we ponder a little deeper there are certain and big realities about which adequate information is lacking. We will recognise the role of reason and intellect.