In common speech, the word "theory" is often used to refer to ideas that have not been proven, but to scientists and philosophers it has a completely different meaning.
In his speech, Mr Denham said disadvantaged white boys had more in common with their poor black classmates than with middle-class white people.
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The President is committed, as he made clear in his speech on Wednesday, to moving forward in a bipartisan way to reach common ground on this important issue of fiscal reform.
In a ground-breaking speech in parliament earlier this month, Mr Erdogan provoked tears when he spoke of the common pain of Turkish and Kurdish mothers who had lost sons in the conflict.
In his keynote speech, Mr Miliband talked about the common bonds of the four countries that make up the United Kingdom.
This common framework leaves surprising room for compromise, and in his speech on January 27th the president was quick to grasp it.
The hate speech and blasphemy laws that are now common in many European countries lack clarity as to precisely what they aim to criminalize.
So the original meaning of the first amendment, for example, is not the common law rights of free speech or the press in 1791 in fact there was no agreed set of such rights at the time but an abstract statement of the right to freedom of expression to be interpreted and reinterpreted as circumstances and society's attitudes change.
Denial of free speech is a common tactic of the Muslim Brotherhood based in Shariah law.
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We regret the significance that Muslim communities around the world have attached to these cartoons, but we also feel slighted that the western media has turned their publication into a free-speech issue when the real issue is one of applying common standards in printing something so offensive.
In a landmark speech Wednesday, President Bush announced that all captured terrorists will receive the protections of Common Article Three of the Geneva Conventions.
As strange as the case is, experts said it touches on a common challenge in law enforcement: deciphering intent without running afoul of the First Amendment right to free speech.
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