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The '''philosophy of science''' is that branch of philosophy concerned with the nature of scientific inquiry.  In its broadest form, its goal is to answer the question: "What is science?"  Its subdisciplines, including [[Philosophy of physics]], [[Philosophy of biology]], [[Philosophy of psychology]], aim to understand and help inform the conceptual underpinnings of their various branches of science.
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The analysis of scientific concepts and [[methodology]], which concerns itself mostly with the foundations of [[science]] and interdisciplinary areas.  Most influential philosophers of Science include Sir [[Karl Popper]].
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In no way should '''philosophy of science''' be confused with [[Natural philosophy]]; the latter was the name given to what we would now call "science" through the end of the Enlightenment.
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==History==
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The philosophy of science comes on the scene following the development of the [[Vienna circle]] of philosophers.  Encouraged by the recent successes in many areas of scientific inquiry, some of these philosophers made an effort to codify and define science.
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===Verificationism===
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Early efforts to codify scientific reasoning center around a principle of '''verification'''.  The slogan would go something like this:
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"A sentence is scientific if and only if it is verifiable; that is, if there is an empirical observation which can be made that supports that sentence."
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Given this definition, the sentence "Hillary Clinton is wearing a pantsuit on 4 July 2008 at 3:55 PM" would be scientific, while the sentence "There is an undetectable unicorn in the yard right now" would not be.   
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Of course, this definition expands the range of science from the layperson's characterization of Serious Persons in Lab Coats, probably holding clipboards; but it is -- according to [[AJ Ayer]] -- a necessary condition for scientific validity.
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====Objections====
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An obvious objection is one formulated by [[Karl Popper]]: the doctrine of verificationism cannot be used to disallow theories whose projections are always verifiable. His chosen example is Freudian [[psychoanalysis]].  Popper claims that there is no behavior which cannot be explained by a Freudian theory.  Now, on the one hand, this might seem like a good result: surely a theory that predicts everything in its bailiwick is a good theory!  But Popper's point is actually more subtle than this:  Freudian psychoanalysis predicts ''too much''.
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===Falsificationism===
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