It is a well known and time tested proverb that a little knowledge is a dangerous thing. For example, the man who knows that drinking juice is useful for health, decides to drink only juice instead of water. Whenever he feels thirsty, he drinks juice not water. This continued for weeks and months. At the end of two months, he finds himself seriously sick. He goes to the doctor to consult about his sickness. The doctor examined his blood and found the lack of some essential minerals in his body. When he was asked why it happened, he told him that it was due to lack of water in his body. Then he realized his folly and repeated the proverb that a little knowledge is a dangerous thing.