Science is simply the classification of the common knowledge of the common people. It is bringing together the things we all know and putting them together so we can use them. This is creation and finds its analogy in Nature, where the elements are combined in certain ways to give us fruits or flowers or grain.

Most of us rather hastily and thoughtlessly regard “science” as a sort of collection of linear accelerators and space vehicles and organic chemistry models. In fact it is not any of these things; it is only a systematic method of gathering and testing knowledge, involving certain formal procedures: gathering information, forming a theory to explain the information, predicting certain consequences of the theory and performing an experiment to test the prediction. If you investigate any area of knowledge (whether it is stellar physics or the number of angels who can dance on the head of a pin) by this method, you are doing science. If you use any other method, you are doing something else.

Science is based on experiment, on a willingness to challenge old dogma, on an openness to see the universe as it really is. Accordingly, science sometimes requires courage - at the very least the courage to question the conventional wisdom.

Science is an attempt, largely successful, to understand the world, to get a grip on things, to get hold of ourselves, to steer a safe course. Microbiology and meteorology now explain what only a few centuries ago was considered sufficient cause to burn women to death.

Science is more than a body of knowledge. It is a way of thinking; a way of skeptically interrogating the universe with a fine understanding of human fallibility.

If we are not able to ask skeptical questions, to interrogate those who tell us that something is true, to be skeptical of those in authority, then, we are up for grabs for the next charlatan (political or religious) who comes rambling along.

Science is a special kind of explanation of the things we see around us. It starts with a problem and curiosity. Something strikes the scientist as odd. It doesn’t fit in with the usual explanation. Maybe harder thinking or more careful observation will resolve the problem. If it remains apuzzle, it stimulates the scientist’s imagination.

Science is a way of describing reality; it is therefore limited by the limits of observation; and it asserts nothing which is outside observation. Anything else is not science; it is scholastics.

Science may be defined as the reduction of multiplicity to unity. It seeks to explain the endlessly diverse phenomena of nature by ignoring the uniqueness of particular events, concentrating on what they have in common and finally abstracting some kind of "law," in terms of which they make sense and can be effectively dealt with.

Science is a way to call the bluff of those who only pretend to knowledge. It is a bulwark against mysticism, against superstition, against religion misapplied to where it has no business being.

Science is the organized skepticism in the reliability of expert opinion.

Science is a way of trying not to fool yourself. The principle is that you must not fool yourself, and you are the easiest person to fool.

Science is... in the broadest sense of organized, objective knowledge.

Science is the description of phenomena and the formulation of their relations.

By science I mean an assemblage of transcendental propositions discoverable by human reason, and reducible to first principles, axioms, or maxims, from which they may all be derived in a regular succession; and there are consequently as many sciences as there are general objects of our intellectual powers: when man first exerts those powers, his objects are himself and the rest of nature; himself he perceives to be composed of body and mind... and in the leisure... his intellect is directed to nature at large, to the substance of natural bodies, to their several properties, and to their quantity... and... arrives at the demonstration of a first intelligent cause; whence his collected wisdom, being arranged in the form of science, chiefly consists of physiology and medicine, metaphysicks and logick, ethicks and jurisprudence, natural philosophy and mathematicks; from which the religion of nature (since revealed religion must be referred to history, as alone affording evidence of it) has in all ages and in all nations been the sublime and consoling result.