It’s essential to our understanding of 9/11, for example, not only that bin Laden acted to harm the United States, and that the World Trade Center was destroyed around that time, but that it was bin Laden’s act that caused the destruction. It’s the causal link between the intention of a particular man and a change in a particular object that distinguishes the mainstream understanding of 9/11 from the conspiracy theories. Linguists call the inventory of concepts and the schemes that combine them “conceptual semantics.” Conceptual semantics—the language of thought—must be distinct from language itself, or we would have nothing to go on when we debate what our words mean.
