Leaving the school, he saw a bus and boarded it, with a tape measure. The seats turned out to be forty inches long. “They estimate kids’ hips are thirteen inches across so they can put them three to a seat,” he said. The aisle was narrower than a normal bus; paramedics knew not to bring a normal-sized stretcher onto a school bus, he later learned, because it wouldn’t fit down the aisle. “I couldn’t design a system better for transmitting disease than our school system,” he said after his visit.