In the early stages of civilization, man used to be scared of the natural forces like thunder, storm and lightning. He used to worship every object of nature like sky, earth, trees, air, sun and moon and even animals were worshipped. It was because man could not understand the natural phenomena1. He was, dependent on nature. Today, man has increased his knowledge and so has his power. The moon and other objects no longer fills man with fear. The earth has few secrets that are not known to man till date. How this tremendous change has come about?
             Scientific studies have revolutionized everything. Electricity is one of the many gifts of scientific invention. All one has to do is to press a button and the room gets brightened up, the fans give refreshing air, an air conditioner turns the room into a hill resort. Various kinds of machines are run by electricity: room-heaters, ovens cooking ranges and several other household appliances. Big industrial units and factories which produce countless things of our daily use are run on electricity.
             Advancement in the field of medical sciences has reduced the rate of mortality. Today, many diseases like cholera, small-pox and even tuberculosis are easily curable with the help of medicines. Surgery can remove tumors and set the human body right is many other ways. Discovery of antibiotics has made the cure of infectious diseases very easy. Open heart surgery and treatment of even cancer have become a possibility. Immunity against certain diseases like plague, cholera and small-pox can be ensured with the help of vaccination. Atomic energy is being used to cure diseases like cancer; radio-active isotopes are increasingly used for this purpose. Today, we are on the verge of cloning of different species.
             Traveling has become fast, safe and comfortable. Long distances can be covered by aero planes, and fast moving trains, cars, buses, trams and scooters have
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