When insulin was discovered in the early 1920s, even jaded professionals marveled at how it brought starved, sometimes comatose diabetics back to life. In the twenty-fifth-anniversary edition of a classic, Michael Bliss unearths scientists’ memoirs and confidential appraisals of insulin by members of the Nobel Committee. he also resolves a longstanding controversy about scientific collaboration at its most fractious and fascinating: who ultimately deserves credit for the discovery? Bliss’s life-and-death saga illuminates one of the most important breakthroughs in the history of medicine.