1) Albert Einstein
We all know him as the Scientist Ultimus who discovered the Theory of Relativity.His discovery of the Photoelectric effect and the discovery of the Brownian motion along with the quantum theory of a monoatomic gas propel him to the top of this list.
Einstein published over 300 scientific and over 150 non-scientific works.
His name is synonymous with the word genius.
His full name is Hans Albert Einstein and he was born into a Jewish family in Ulm in Germany on 14th March 1879.
His works on the nature of light are unparalleled and incomparable.
His personal life was as interesting as his professional as he married twice and his second wife was also his cousin.He was known to have a good ear for music.
2) Sir Isaac Newton
We all know him as the founder of the theory of Gravitation and the discovery of the Laws of motion. His work in Optics is also highly admirable.He enunciated the law of Conservation of Momentum and Angular Momentum.He also developed an empirical law of cooling and he was the first to observe that light could be split by a prism.He also studied the speed of sound.
In mathematics, also he developed Integral Calculus.He also contributed to the formation of power series.
Isaac Newton was born on 4 January 1643 in Lincolnshire in England.
He was the president of the Royal Society till his death.
3) Galileo Galilei
It is true that Galileo who is generally credited with the invention of the Telescope was not the one to invent it. But he was the first person to make full use of it as he observed the Jupiter's rings with it.(Read more about this here)
4) Thomas Alva Edison
The greatest inventor of all times with more than 1000 inventions to his name did not even get a Nobel prize.His inventions were not only useful to everyone but also so sturdy that they are being used with little modification even today.
The law of buoyancy and his discovery of the laws of Fluid Mechanics make him one of the greatest.