our century has seen great changes in their lives and living conditions of human beingsEverything we do today, seem to be less than a hundred years ago can not be implementedNo one can imagine that, people can fly or listen to music away from thousands of miles awayToday, radio and television serves many purposes in addition to entertainmentThey help us to find the fish in the sea and landing craft in bad weather or in the darknessThey also control the activity of many industrial machineryNever in the history of the quick changes in the way we live as at the momentScientists are using what is known as "the scientific method" to make new discoveriesOf the most important scientific discovery has new drugsThere are many diseases that 50 years ago people had to die for it, today it is no longer dangerous.Scientific research helps us to expand into a whole new world for usThe progress of science is to bring people to a better lifeThe progress of science in the 20th century
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