Science has brought revolution in the present world. It has changed the idea and nature of war. Wars were fought in ancient days between the army of one country and that of another with arrows, spears, hatchets and swords. They were won or lost in the battlefields. Personal bravery was a matter of great honour. These wars were limited only to the battlefield. The cultivators of lands, the school-children, the old, the women, the shop-keepers and workers in the factories were not attacked by the enemy. Wars in olden days were less destructive, but now the whole scene is different. Countless people are killed in the war now.
The modern inventions of science have made war more deadly and more extensive. With the invention of gun and gunpowder, science made an epoch-making contribution to war. During the course of time refuels and cannons were made and used by the soldiers. The use of such deadly weapons first began in the East. During the World War I, science took a sudden leap and became a hand-maid to war. War was mechanized. Guns were improved to bombard forts and cities situated at a distance of sixty or seventy miles. Bombs grew heavier and heavier. Now the wars are won or lost in the laboratories and workshops. They are the busiest centres of modern warfare. The soldiers have become only tools that apply these inventions of science.
During the World War II, the Germans invented more terrible weapons of war to be used on the ground, in the sea and in the air. But each weapon of offence was met with an equally strong weapon of defence. Tanks were met with anti-tank guns, poisonous gas brought about the manufacture of gas masks. To bring down the bombers, anti-aircraft guns came into being. Now atomic-bomb, Cobalt bomb. Hydrogen bomb, Nitrogen bomb and Inter-continental missiles have been invented. The scientists have developed and cultivated different kinds of germs. They poison air. water and food. People die within no time. In this way man has lost his importance. He is just like a housefly.
The modern war brings ruin and devastation not only to the armies but also to the poor civilians, Innocent men, women and children living in towns and cities are bombarded indiscriminately and killed. It is a war in which everybody is attacked and destroyed. With the raid means of communications and inventions like jets and missiles, war has lost its local characteristics. It has become international. A war between two nations spreads like wildfire throughout the world. There is a now field which is not affected by the present horrible war.
With all these demerits science has also served the human beings at a large scale. Defensive weapons like the gas-masks, antitank guns, anti-aircraft guns and radars are there for our safety. Some inventions of science are used for the amelioration of pain and suffering and for saving men from disease and death. Science has also made wonderful progress in the field of medicine and surgery. If we use science only for betterment of mankind, it will become a great blessing for human beings.