@evan
In my mind intelligence is summed up as the ability to perceive the world outside ourselves (and ourselves) and make predictions about what-ifs to decide what one's own actions one should do to make things happen in a way that pleases us.
This ability requires a model of the world be in our brain and the basic building blocks of that model is knowledge, including rules for how things work (applying rules plus observation plus memory is the main engine of intelligence)