Stanfordʼ’s Artificial Intelligence lab, building a system to diagnose a common infectious disease. After years of sweat and toil, the day comes for the test: a head-‐‑‒to-‐‑‒head comparison with five of the top human experts in infectious disease. Over the first expert, your system squeezes a narrow victory, winning by just 4%. It beats the second, third, and fourth doctors handily. Against the fifth, it wins by an astounding 52%.