Observation, reason, and experiment make up what we call the scientific method. — Richard P. Feynman Copy Share Image
The test of all knowledge is experiment. Experiment is the sole judge of scientific truth. — Richard P. Feynman Copy Share Image
The fundamental principle of science, the definition almost, is this: the sole test of the validity of any idea is experiment. — Richard P. Feynman Copy Share Image
“Mathematics is not a science from our point of view, in the sense that it is not a natural science. The test… — Richard P. Feynman Copy Share Image
It is always good to know which ideas cannot be checked directly, but it is not necessary to remove them all. It… — Richard P. Feynman Copy Share Image
The situation in the sciences is this: A concept or an idea which cannot be measured or cannot be referred directly to… — Richard P. Feynman Copy Share Image
If you're doing an experiment, you should report everything that you think might make it invalid - not only what you think… — Richard P. Feynman Copy Share Image
“In general, we look for a new law by the following process: First we guess it; then we compute the consequences of… — Richard P. Feynman Copy Share Image
The principle of science, the definition, almost, is the following: The test of all knowledge is experiment. Experiment is the sole judge… — Richard P. Feynman Copy Share Image
What is the fundamental hypothesis of science, the fundamental philosophy? We stated it in the first chapter: the sole test of the… — Richard P. Feynman Copy Share Image
“Philosophers have said before that one of the fundamental requisites of science is that whenever you set up the same conditions, the same thing… — Richard P. Feynman Copy Share Image
My rule is, when you are unhappy, think about it. But when you're happy, don't. Why spoil it? You're probably happy for some ridiculous… — Richard P. Feynman Copy Share Image
Trying to understand the way nature works involves a most terrible test of human reasoning ability. It involves subtle trickery, beautiful tightropes of logic… — Richard P. Feynman Copy Share Image
Mathematics is a language plus reasoning; it is like a language plus logic. Mathematics is a tool for reasoning. — Richard P. Feynman Copy Share Image
It is necessary for the very existence of science that minds exist which do not allow that nature must satisfy some preconceived conditions. — Richard P. Feynman Copy Share Image
“There was a Princess Somebody of Denmark sitting at a table with a number of people around her, and I saw an empty chair… — Richard P. Feynman Copy Share Image
All the time you're saying to yourself, 'I could do that, but I won't,'--which is just another way of saying that you can't. — Richard P. Feynman Copy Share Image
“There's a big difference between knowing the name of something and knowing something.” — Richard P. Feynman Copy Share Image
The fact that you are not sure means that it is possible that there is another way someday. — Richard P. Feynman Copy Share Image
One cannot understand... the universality of laws of nature, the relationship of things, without an understanding of mathematics. There is no other way to… — Richard P. Feynman Copy Share Image
