This whole line of reasoning sounds like a philosopher debating the number of teeth in a horse's mouth. Just come visit San Francisco and see the evidence. Loo

This whole line of reasoning sounds like a philosopher debating the number of teeth in a horse's mouth. Just come visit San Francisco and see the evidence. Look in the horse's mouth, so to speak. The cars are driving around a complex city, without a driver, and doing an amazing job. The progress is real.