It was the first beautiful Saturday in spring, and I was in
charge of my children. We were out browsing the stores around our local green when the page came in. Lawrence Cohen, a preeminent cardiologist and my colleague at Yale University, was distraught. Normally a man of few words, Cohen was speaking quickly, almost feverishly. "I need you, John. In the ER. Right away. She's dying, John. She's dying right in front of me."