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Use the quotes to provide students with a quick access point into the natural sciences, prompt discussions and debates in your classroom, and introduce a range of influential thinkers.

We've arranged these quotes in a way that relates to our 5 Big Question framework for TOK, which is our favoured way of structuring the course. There are other ways to structure TOK, such as the Classic structure.

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There is no great invention without a great imagination.

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There is no great invention without a great imagination.

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Ada Lovelace

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When it comes to atoms, language can be used only as in poetry. The poet, too, is not nearly so concerned with describing facts as with creating images.

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When it comes to atoms, language can be used only as in poetry. The poet, too, is not nearly so concerned with describing facts as with creating images.

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Niels Bohr

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The problems of language here are really serious. We wish to speak in some way about the structure of the atoms. But we cannot speak about atoms in ordinary language.

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The problems of language here are really serious. We wish to speak in some way about the structure of the atoms. But we cannot speak about atoms in ordinary language.

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Werner Heisenberg

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The most exciting phrase to hear in science, the one that heralds the most discoveries, is not “Eureka!” (I found it!) but “That’s funny…”

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The most exciting phrase to hear in science, the one that heralds the most discoveries, is not “Eureka!” (I found it!) but “That’s funny…”

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Isaac Asimov

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If I have seen further than others, it is by standing upon the shoulders of giants.

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If I have seen further than others, it is by standing upon the shoulders of giants.

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Isaac Newton

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I never made one of my discoveries through the process of rational thinking

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I never made one of my discoveries through the process of rational thinking

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Albert Einstein

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The saddest aspect of life right now is that science gathers knowledge faster than society gathers wisdom.

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The saddest aspect of life right now is that science gathers knowledge faster than society gathers wisdom.

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Isaac Asimov

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The important thing in science is not so much to obtain new facts as to discover new ways of thinking about them.

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The important thing in science is not so much to obtain new facts as to discover new ways of thinking about them.

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William Lawrence Bragg

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Science is not about control. It is about cultivating a perpetual condition of wonder in the face of something that forever grows one step richer and subtler than our latest theory about it. It is about reverence, not mastery.

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Science is not about control. It is about cultivating a perpetual condition of wonder in the face of something that forever grows one step richer and subtler than our latest theory about it. It is about reverence, not mastery.

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Richard Powers

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Nothing is less predictable than the development of an active scientific field.

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Nothing is less predictable than the development of an active scientific field.

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Charles Francis Richter

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No amount of experimentation can ever prove me right; a single experiment can prove me wrong.

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No amount of experimentation can ever prove me right; a single experiment can prove me wrong.

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Albert Einstein

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The great tragedy of science – the slaying of a beautiful hypothesis by an ugly fact.

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The great tragedy of science – the slaying of a beautiful hypothesis by an ugly fact.

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Thomas Huxley

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Every great advance in science has issued from a new audacity of imagination.

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Every great advance in science has issued from a new audacity of imagination.

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John Dewey

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Men love to wonder, and that is the seed of science.

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Men love to wonder, and that is the seed of science.

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Ralph Waldo Emerson

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The greatest discoveries of science have always been those that forced us to rethink our beliefs about the universe and our place in it.

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The greatest discoveries of science have always been those that forced us to rethink our beliefs about the universe and our place in it.

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Robert L. Park

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To know the history of science is to recognize the mortality of any claim to universal truth.

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To know the history of science is to recognize the mortality of any claim to universal truth.

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Evelyn Fox Keller

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In science, ‘fact’ can only mean ‘confirmed to such a degree that it would be perverse to withhold provisional assent.’ I suppose that apples might start to rise tomorrow, but the possibility does not merit equal time in physics classrooms.

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In science, ‘fact’ can only mean ‘confirmed to such a degree that it would be perverse to withhold provisional assent.’ I suppose that apples might start to rise tomorrow, but the possibility does not merit equal time in physics classrooms.

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Stephen Jay Gould

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It is through science that we prove, but through intuition that we discover.

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It is through science that we prove, but through intuition that we discover.

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Henri Poincare

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When a scientist is ahead of his times, it is often through misunderstanding of current, rather than intuition of future truth. In science there is never any error so gross that it won’t one day, from some perspective, appear prophetic.

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When a scientist is ahead of his times, it is often through misunderstanding of current, rather than intuition of future truth. In science there is never any error so gross that it won’t one day, from some perspective, appear prophetic.

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Jean Rostand

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Scientists have become the bearers of the torch of discovery in our quest for knowledge.

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Scientists have become the bearers of the torch of discovery in our quest for knowledge.

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Stephen Hawking

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Science and technology revolutionize our lives, but memory, tradition and myth frame our response.

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Science and technology revolutionize our lives, but memory, tradition and myth frame our response.

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Arthur M. Schlesinger

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Science is the father of knowledge, but opinion breeds ignorance.

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Science is the father of knowledge, but opinion breeds ignorance.

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Hippocrates

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Art is the tree of life. Science is the tree of death.

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Art is the tree of life. Science is the tree of death.

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William Blake

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Poets say science takes away from the beauty of the stars – mere globs of gas atoms. I, too, can see the stars on a desert night, and feel them. But do I see less or more?

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Poets say science takes away from the beauty of the stars – mere globs of gas atoms. I, too, can see the stars on a desert night, and feel them. But do I see less or more?

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Richard P. Feynman

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Science and art belong to the whole world, and before them vanish the barriers of nationality.

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Science and art belong to the whole world, and before them vanish the barriers of nationality.

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Johann von Goethe

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Claude Bernard

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There is a single light of science, and to brighten it anywhere is to brighten it everywhere.

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There is a single light of science, and to brighten it anywhere is to brighten it everywhere.

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Isaac Asimov

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Science is the best idea humans have ever had. The more people who embrace that idea, the better.

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Science is the best idea humans have ever had. The more people who embrace that idea, the better.

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Bill Nye

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Science is global. Einstein’s equation, E=mc2, has to reach everywhere. Science is a beautiful gift to humanity, we should not distort it. Science does not differentiate between multiple races.

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Science is global. Einstein’s equation, E=mc2, has to reach everywhere. Science is a beautiful gift to humanity, we should not distort it. Science does not differentiate between multiple races.

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Abdul Kalam

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Science is the great antidote to the poison of enthusiasm and superstition.

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Science is the great antidote to the poison of enthusiasm and superstition.

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Adam Smith

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But in science the credit goes to the man who convinces the world, not to the man to whom the idea first occurs.

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But in science the credit goes to the man who convinces the world, not to the man to whom the idea first occurs.

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Francis Darwin

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Rockets are cool. There’s no getting around that.

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Rockets are cool. There’s no getting around that.

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Elon Musk

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It turns out, all you need to do when you read or hear something that sounds smart, is try to translate it back into ordinary language – or better yet, have the person explain it for you – without using any scientific jargon or terms, and see if it still makes sense.

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It turns out, all you need to do when you read or hear something that sounds smart, is try to translate it back into ordinary language – or better yet, have the person explain it for you – without using any scientific jargon or terms, and see if it still makes sense.

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Richard Feynman

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Scientific knowledge is a kind of discourse.

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Scientific knowledge is a kind of discourse.

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Jean-Francois Lyotard

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Karl Pearson

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Science is a beautiful gift to humanity; we should not distort it.

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Science is a beautiful gift to humanity; we should not distort it.

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A.P.J. Abdul Karam

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Most of the fundamental ideas of science are essentially simple, and may, as a rule, be expressed in a language comprehensible to everyone.

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Most of the fundamental ideas of science are essentially simple, and may, as a rule, be expressed in a language comprehensible to everyone.

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Albert Einstein

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Vanity of science. Knowledge of physical science will not console me for ignorance of morality in a time of affliction, but knowledge of morality will always console me for ignorance of physical science.

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Vanity of science. Knowledge of physical science will not console me for ignorance of morality in a time of affliction, but knowledge of morality will always console me for ignorance of physical science.

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Blaise Pascal

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Science has made us gods even before we are worthy of being men.

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Science has made us gods even before we are worthy of being men.

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Jean Rostand

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Even if the open windows of science at first make us shiver after the cosy indoor warmth of traditional humanizing myths, in the end the fresh air brings vigour, and the great spaces have a splendour of their own.

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Even if the open windows of science at first make us shiver after the cosy indoor warmth of traditional humanizing myths, in the end the fresh air brings vigour, and the great spaces have a splendour of their own.

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Bertrand Russell

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There’s nothing I believe in more strongly than getting young people interested in science and engineering, for a better tomorrow, for all humankind.

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There’s nothing I believe in more strongly than getting young people interested in science and engineering, for a better tomorrow, for all humankind.

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Bill Nye

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I am compelled to fear that science will be used to promote the power of dominant groups rather than to make men happy.

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I am compelled to fear that science will be used to promote the power of dominant groups rather than to make men happy.

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Bertrand Russell

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The virtues of science are skepticism and independence of thought.

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The virtues of science are skepticism and independence of thought.

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Walter Gilbert

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The universe we observe has precisely the properties we should expect if there is, at bottom, no design, no purpose, no evil, no good, nothing but blind, pitiless indifference.

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The universe we observe has precisely the properties we should expect if there is, at bottom, no design, no purpose, no evil, no good, nothing but blind, pitiless indifference.

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Richard Dawkins

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Science without religion is lame, religion without science is blind.

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Science without religion is lame, religion without science is blind.

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Albert Einstein

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When I find myself in the company of scientists, I feel like a shabby curate who has strayed by mistake into a room full of dukes.

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When I find myself in the company of scientists, I feel like a shabby curate who has strayed by mistake into a room full of dukes.

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W.H. Auden

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Science can teach us, and I think our own hearts can teach us, no longer to look around for imaginary supports, no longer to invent allies in the sky, but rather to look to our own efforts here below to make this world a fit place to live in, instead.

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Science can teach us, and I think our own hearts can teach us, no longer to look around for imaginary supports, no longer to invent allies in the sky, but rather to look to our own efforts here below to make this world a fit place to live in, instead.

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Bertrand Russell

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Science is organized knowledge. Wisdom is organized life.

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Science is organized knowledge. Wisdom is organized life.

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Immanuel Kant

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We especially need imagination in science. It is not all mathematics, nor all logic, but it is somewhat beauty and poetry.

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We especially need imagination in science. It is not all mathematics, nor all logic, but it is somewhat beauty and poetry.

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Maria Mitchell

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We especially need imagination in science. It is not all mathematics, nor all logic, but it is somewhat beauty and poetry.

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We especially need imagination in science. It is not all mathematics, nor all logic, but it is somewhat beauty and poetry.

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Stephen Hawking

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In an eagle there is all the wisdom of the world.

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In an eagle there is all the wisdom of the world.

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Lame Deer

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Science is not only a disciple of reason but, also, one of romance and passion.

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Science is not only a disciple of reason but, also, one of romance and passion.

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Stephen Hawking

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Science, at bottom, is really anti-intellectual. It always distrusts pure reason, and demands the production of objective fact.

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Science, at bottom, is really anti-intellectual. It always distrusts pure reason, and demands the production of objective fact.

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H.L. Mencken

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Science does not know its debt to imagination.

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Science does not know its debt to imagination.

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Ralph Waldo Emerson

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Research is what I’m doing when I don’t know what I’m doing.

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Research is what I’m doing when I don’t know what I’m doing.

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Werner von Braun

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Science is a way of thinking much more than it is a body of knowledge.

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Science is a way of thinking much more than it is a body of knowledge.

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Carl Sagan

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Science is fun. Science is curiosity. We all have natural curiosity. Science is a process of investigating. It’s posing questions and coming up with a method. It’s delving in.

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Science is fun. Science is curiosity. We all have natural curiosity. Science is a process of investigating. It’s posing questions and coming up with a method. It’s delving in.

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Sally Ride

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Science is simply common sense at its best, that is, rigidly accurate in observation, and merciless to fallacy in logic.

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Science is simply common sense at its best, that is, rigidly accurate in observation, and merciless to fallacy in logic.

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Thomas Huxley

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Medicine is a science of uncertainty and an art of probability.

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Medicine is a science of uncertainty and an art of probability.

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William Osler