Since the beginning of time, some experts in different field have not just discovered the basis of human beings, flora and fauna, but have also invented innumerable items that have helped the mankind to live better. Such people are called scientists- those individuals who not just acquire knowledge, but also use it in scientific and systematic ways to understand the physical, social and mathematical realms of this world.  Although the term ‘scientists’ was coined in 1833 by William Whewell, there is no denying about the fact that scientists have been in the world since the time mankind existed. Otherwise, how could you imagine existence of artificial things, from simple safety pins to a sophisticated airplane? People like Issac Newton, Albert Einstein, Sigmund Freud, Aryabhatta and Bhaskara are some of the scientists. Do you know some more popular scientists who have changed the shape of this world?