A little boy accompanied by his father was taken to a museum of diseases. His father gloated upon mankind's successes in alleviating diseases. The first window showed smallpox and its demise, the second window showed plague and its extermination, and the third window showed malaria and its systematic decimation. The little boy's faith in dominance of medical science soared and he started getting convinced in the infallibility of man as he mounted the steps to the second floor of the museum. The second floor was damp and squidgy and so became the little boy's enthusiasm when he saw con-