If you've spent time in New Orleans, you probably know about the power of the po' boy. This particular take on the classic creole sandwich is stacked with blackened salmon, peppery arugula, and sliced tomato—all on a soft hoagie roll slathered in tangy tartar sauce. Even the potato salad...
Performance, 26 percent; ease of use, 24 percent; design, 20 percent; features, 19 percent; cost of test strips, 6 percent; and training; five percent. I asked Mr. Johnson how he decided the weighing of these factors. “We didn’t,” he replied. “The data decided it.” It depended...