On Wednesday, Google’s home page featured a happy illustration. In a street scene, smiling adults watched children play joyfully. Two children carried a sign in honor of the occasion: “Thank you, Dr. Salk!”

On the 100th anniversary of Jonas Salk’s birth, some stopped to recognize his achievement and generosity in developing a polio vaccine and sharing it with the world. Many were happily oblivious to the day’s significance because we were born into a society almost entirely free from the…  [more]