e OpenCyc concepts and relationships are derived from, and form the backbone of, the <a href="http://en.wikipedia.org/wiki/Knowledge_base" title="Knowledge base" rel="wikipedia" class="zem_slink">Knowledge Base</a> in the Cyc System. Over the past 24 years, the Cyc project has been capturing and representing &#8220;common sense&#8221; knowledge &#8211; real-world concepts and the relationships among them &#8211; in a way that allows computers to reason about them.  The OpenCyc ontology contains machine- and