The word "theory" has a number of distinct meanings in different fields of knowledge, depending on the context and their methodologies. In common usage, people use the word "theory" to signify "conjecture", "speculation", or "opinion." In this sense, "theories" are opposed to "facts" — parts of the world, or claims about the world, that are real or true regardless of what people think.

In science, a theory is a proposed description, explanation, or model of the manner of interaction of a set of natural phenomena, capable of predicting future occurrences or observations of the same kind, and capable of being tested through experiment or otherwise falsified through empirical observation. It follows from this that for scientists "theory" and "fact" do not necessarily stand in opposition. For example, it is a fact that an apple dropped on earth has been observed to fall towards the center of the planet, and the theory which explains why the apple behaves so is the current theory of gravitation.

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probably not the best days for string theorists http://www.scientificamerican.com/article.cfm?id=splitting-time-from-space
smilingmachine (Mike) Tue, 24 Nov 2009 14:10:55 -0000
probably not the best days for string theorists http://www.scientificamerican.com/article.cfm?id=splitting-time-from-space
Conspiracy theorists running wild on Joe Duffy on #rte at the moment. Not a shred of evidence to support any assertions, but so what? #rte
judehamilton (Jude Hamilton) Tue, 24 Nov 2009 13:58:23 -0000
Conspiracy theorists running wild on Joe Duffy on #rte at the moment. Not a shred of evidence to support any assertions, but so what? #rte
@cburell There have also been a number of observations made about the filming of this incident by conspiracy theorists over the years... :-)
PragueBob (Robert S. Morrison) Tue, 24 Nov 2009 13:39:02 -0000
@cburell There have also been a number of observations made about the filming of this incident by conspiracy theorists over the years... :-)
Grist for Goldman conspiracy theorists http://bit.ly/58idmc
OptARM (Rolfe Winkler) Tue, 24 Nov 2009 13:33:57 -0000
Grist for Goldman conspiracy theorists http://bit.ly/58idmc
Why do Global Warming conspiracy theorists persist under the assumption that Al Gore has black helicopter and white van power? He's AL GORE.
UglyGrlzArntPPL (Alex Gawenda) Tue, 24 Nov 2009 13:26:24 -0000
Why do Global Warming conspiracy theorists persist under the assumption that Al Gore has black helicopter and white van power? He's AL GORE.
RT @tweetmeme The Skeptical OB http://bit.ly/1iCqKI Vaccine conspiracy theorists need to read this
PregnancyMyths (Shawn Tassone, MD) Tue, 24 Nov 2009 12:10:51 -0000
RT @tweetmeme The Skeptical OB http://bit.ly/1iCqKI Vaccine conspiracy theorists need to read this

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