Related by context. Frequent words. (Click for all words.) 56 Albert Einstein 52 quantum mechanics 52 Einstein 49 quantum theory 47 quantum physics 46 Louis Pasteur 46 Benjamin Franklin 45 relativity 45 Sigmund Freud 45 Pythagoras 45 Stephen Hawking 45 mathematicians 45 Isaac Asimov 45 thermodynamics 45 Francis Bacon 44 Charles Darwin 44 Aristotle 44 gravitation 43 Einstein theory 43 mathematician 43 John Maynard Keynes 42 Winston Churchill 42 physics 41 general relativity 41 Carl Sagan 41 Herschel 41 Thomas Aquinas 40 Copernicus 40 Oliver Wendell Holmes 40 Sir Winston Churchill 40 Karl Marx 40 philosophers 39 Bertrand Russell 39 Rev. Martin Luther 39 Archimedes 39 Napoleon Bonaparte 39 celestial bodies 39 Leonardo da Vinci 39 theorem 39 Asimov 39 theoretical physicist 39 Martin Luther King 38 cosmology 38 Linnaeus 38 HG Wells 38 Thomas Paine 38 Enlightenment 38 Mises 38 cosmologists 38 Nobel Prize winners 38 Galileo 38 ancients 37 Theoretical Physics 37 cosmic 37 physicists 37 Edmund Burke 37 ancient Greeks 37 cosmos 37 Confucius 36 universe 36 theoretical physics 36 Kepler 36 Tutankhamun 36 Alexis de Tocqueville 36 Milton Friedman 36 mathematical 36 astronomer 36 inventions 36 Orville Wright 36 Dr. Martin Luther 36 Abraham Lincoln 35 cosmological 35 Faraday 35 Martin Luther 35 seventeenth century 35 GK Chesterton 35 philosopher 35 Oliver Cromwell 35 Queen Victoria 35 Dr. Seuss 35 Napoleon 35 Keynes 35 Galton 35 Philosopher 35 Da Vinci 35 JRR Tolkien 35 equations 35 Turing 34 Henry VIII 34 Darwin theory 34 Wittgenstein 34 gravitational 34 mathematical formula 34 David Attenborough 34 Mahatma Gandhi 34 Carl Jung 34 Charlie Chaplin 34 Magna Carta 34 cosmic microwave background 34 Caltech 34 Nostradamus