Computer metaphor and analogy to flight: We don't need flapping wings to fly, so we don't need a human brain (nor even human software) to think.
Early successes: e.g., play checkers, solve integrals with 100 heuristics.
2. Thousands of embodied experiences.
Problem: There is a case of a patient with no motor abilities who nevertheless has common sense.
3. Common sense requires a brain (after all).
e.g., neural network models (such as NETtalk, driving a van)
Problems: generalization, representation, scaling up, and modular organization.