"The greatest shortcoming of the human race is our inability to understand the exponential function". said a great physicist. This can be illustrated by a simple story. Once a king a offered a reward to a poet. He asked the poet what he desired to have? The poet replied,"chess board filled up with grains". The king exclaimed,"what"?. The poet said, "I want a chess board filled up with grains in this way. Put one gra...