Ignas Samelwis, a Hungarian Physician

In the real world, misinformation spreads because of some combination of network effects and psychological and cognitive biases. You see the same thing in the case of the hungarian physician, ignas samelwis. He was an insider, a man and a doctor. But it turned out even these were not enough to overcome the barriers that confront the truth. It took in decades for hand washing practice o actually spread.