100 People Who Changed History and the World Manjunath R. Abstract This book takes readers back and forth through achievements of 100 world's most inspirational and influential people (from brainy biologists and clever chemists to magnificent mathematicians and phenomenal physicists) who have shaped our society and how we see the world around us. "The only true wisdom is in knowing you know nothing." ʊ6RFUDWHV Edited By Manjunath.R #16/1, 8th Main Road, Shivanagar, Rajajinagar, Bangalore560010, Karnataka, India *Corresponding Author Email: [email protected] *Website: http://www.myw3schools.com/ This book takes readers back and forth through achievements of 100 world's most inspirational and influential people (from brainy biologists and clever chemists to magnificent mathematicians and phenomenal physicists) who have shaped our society and how we see the world around us. Contents 100 Most Influential Scientists Who Shaped World History 1 100 most influential people in the world 176 This book is licensed under the terms of the Creative Commons Attribution 4.0 International (CC BY-NC 4.0) License ( https://creativecommons.org/licenses/by-nc/4.0/ ). 100 Most Influential Scientists Who Shaped World History [1] Sir Isaac Newton Birth: Dec. 25, 1642 [Jan. 4, 1643, New Style], Woolsthorpe, Lincolnshire, England Death: March 20 [March 31], 1727, London Known for: the Newtonian Revolution Sir Isaac Newton was an English physicist and mathematician and was the culminating figure of the Scientific Revolution of the 17th century. In optics, his discovery of the composition of white light integrated the phenomena of colours into the science of light and laid the foundation for modern physical optics. In mechanics, his three laws of motion, the basic principles of modern physics, resulted in the formulation of the law of universal gravitation. In PDWKHPDWLFVKHZDVWKHRULJLQDOGLVFRYHUHURIWKHLQILQLWHVLPDOFDOFXOXV1HZWRQ¶V3KLORVRSKLDH1DWXUDOLV3ULQFL pia Mathematica (Mathematical Principles of Natural Philosophy, 1687) was one of the most important single works in the history of modern science. [2] Albert Einstein Birth: March 14, 1879, Ulm, Wurttemberg, Germany Death: April 18, 1955, Princeton, N.J., U.S. Known for: Twentieth-Century Science Albert Einstein was a German-born physicist who developed the special and general theories of relativity and won the Nobel Prize for Physics in 1921 for his explanation of the photoelectric effect. Einstein is generally considered the most influential physicist of the 20th century. [3] Niels Bohr Birth: Oct. 7, 1885, Copenhagen, Denmark Death: Nov. 18, 1962, Copenhagen Known for: the Atom Niels Henrik David Bohr was a Danish physicist who is generally regarded as one of the foremost physicists of the 20th century. He was the first to apply the quantum concept, which restricts the energy of a system to certain discrete values, to the problem of atomic and molecular structure. For that work he received the Nobel Prize for Physics in 1922. His manifold roles in the origins and development of quantum physics may be his most-important contribution, but through his long career his involvements were substantially broader, both inside and outside the world of physics. [4] Charles Darwin Birth: Feb. 12, 1809, Shrewsbury, Shropshire, England Death: April 19, 1882, Downe, Kent Known for: Evolution Charles Robert Darwin was an English naturalist whose scientific theory of evolution by natural selection became the foundation of modern evolutionary studies. An affable country gentleman, Darwin at first shocked religious Victorian society by suggesting that animals and humans shared a common ancestry. However, his nonreligious biology appealed to the rising class of professional scientists, and by the time of his death evolutionary imagery had spread through all of science, literature, and politics. Darwin, himself an agnostic, was accorded the ultimate British accolade of burial in Westminster Abbey, London. [5] Louis Pasteur Birth: Dec. 27, 1822, Dole, France Death: Sept. 28, 1895, Saint-Cloud, near Paris Known for: the Germ Theory of Disease Louis Pasteur was a French chemist and microbiologist who was one of the most important founders of medical PLFURELRORJ\ 3DVWHXU¶V FRQWULEXWLRQV WR VFLHQFH WHFKQRORJ\ DQG PHGLFLQH DUH QHDUO\ ZLWKRXW SUHFHGHQW +H pioneered the study of molecular asymmetry; discovered that microorganisms cause fermentation and disease; originated the process of pasteurization; saved the beer, wine, and silk industries in France; and developed vaccines against anthrax and rabies. [6] Sigmund Freud Birth: 0D\)UHLEHUJ0RUDYLD$XVWULDQ(PSLUH>QRZ3ĜLERU&]HFK5HSXEOLF@ Death: Sept. 23, 1939, London, England Known for: Psychology of the Unconscious Sigmund Freud was an Austrian neurologist and the founder of psychoanalysis, a clinical method for treating psychopathology through dialogue between a patient and a psychoanalyst. [7] Galileo Galilei Birth: Feb. 15, 1564, Pisa [Italy] Death: Jan. 8, 1642, Arcetri, near Florence Known for: the New Science Galileo was an Italian natural philosopher, astronomer, and mathematician who made fundamental contributions to the sciences of moti on, astronomy, and strength of materials and to the development of the scientific method. His formulation of (circular) inertia, the law of falling bodies, and parabolic trajectories marked the beginning of a fundamental change in the study of motion. His insistence that the book of nature was written in the language of mathematics changed natural philosophy from a verbal, qualitative account to a mathematical one in which experimentation became a recognized method for discovering the facts of nature. Final ly, his discoveries with the telescope revolutionized astronomy and paved the way for the acceptance of the Copernican heliocentric system, but his advocacy of that system eventually resulted in an Inquisition process against him. "If I have seen further it is by standing on the shoulders of Giants." ʊ,VDDF1HZWRQ Newton's Three Laws of Motion: x Every object in a state of rest will remain in that state of rest unless an external force acts on it. x Force = mass × acceleration. x For every action there is an equal and opposite reaction. Newton's law of universal gravitation: FG = ୋ୑୫ మ ୖ where F G denote the gravitational force acting between two objects, M and m the masses of the objects, r the distance between the centers of their masses, and G the gravitational constant. "Logic will get you from A to Z; imagination will get you everywhere." ʊ$OEHUW(LQVWHLQ Einstein's mass-energy relation Energy = mass × (speed of light) 2 Einstein's special relativity equations: Relativistic mass = ୰ୣୱ୲୫ୟୱୱ ሺ౬౛ౢ౥ౙ౟౪౯ሻమ ටଵିሺ౩౦౛౛ౚ౥౜ౢ౟ౝ౞౪ሻమ Contracted Length = original length × మ ሺ୴ୣ୪୭ୡ୧୲୷ሻ మ ටͳ െ ሺୱ୮ୣୣୢ୭୤୪୧୥୦୲ሻ Dilated time = ୱ୲ୟ୲୧୭୬ୟ୰୷୲୧୫ୣ ሺ౬౛ౢ౥ౙ౟౪౯ሻమ ටଵିሺ౩౦౛౛ౚ౥౜ౢ౟ౝ౞౪ሻమ Einstein's Photoelectric Equation: Minimum energy needed Maximum kinetic energy Energy of photon = + to remove an electron of the emitted electron Einstein's General Theory of Relativity: Strain stress mass-energy stress ןSpace-time curvature ן Curvature from stuff Curvature of space-time Mass-energy stress in space-time + itself = "Those who are not shocked when they first come across quantum theory cannot possibly have understood it." ʊ1LHOV%RKU In 1911, fresh from completion of his PhD, the young Danish physicist Niels Bohr left Denmark on a foreign scholarship headed for the Cavendish Laboratory in Cambridge to work under J. J. Thomson on the structure of atomic systems. At the time, Bohr began to put forth the idea that since light could no long be treated as continuously propagating waves, but instead as discrete energy packets (as articulated by Max Planck and Albert Einstein ), why should the classical Newtonian mechanics on which Thomson's model was based hold true? It seemed to Bohr that the atomic model should be modified in a similar way. If electromagnetic energy is quantized, i.e. restricted to take on only integer values of Kȣ ZKHUH ȣ LV WKH IUHTXHQF\ RI OLJKW WKHQ LW seemed reasonable that the mechanical energy associated with the energy of atomic electrons is also quantized. However, Bohr's still somewhat vague ideas were not well received by Thomson, and Bohr decided to move from Cambridge after his first year to a place where his concepts about quantization of electronic motion in atoms would meet less opposition. He chose the University of Manchester, where the chair of physics was held by Ernest Rutherford . While in Manchester, Bohr learned about the nuclear model of the atom proposed by Rutherford. To overcome the difficulty associated with the classical collapse of the electron into the nucleus, Bohr proposed that the orbiting electron could only exist in certain special states of motion - called stationary states, in which no electromagnetic radiation was emitted. In these states, the angular momentum of the electron L takes RQLQWHJHUYDOXHVRI3ODQFN VFRQVWDQWGLYLGHGE\ʌ denoted by = (pronounced h-bar). In these stationary states, the electron angular momentum ୦ FDQWDNHRQYDOXHV԰ ଶ஠ ƫƫƫEXWQHYHUQRQ -integer values. This is known as quantization of angular momentum, and was one of Bohr's key hypotheses. He imagined the atom as consisting RIHOHFWURQZDYHVRIZDYHOHQJWKȜ = endlessly circling atomic nuclei. ୦ ୦ ୫୴ ୮ In his picture, only orbits with circumferences corresponding to an integral multiple of electron wavelengths could survive without destructive interference (i.e., r = could survive without ୬԰ destructive interference). For circular orbits,