Maths Legends: A Game of Chess

The video narrates a tale from ancient India where a traveller challenges a king to a chess match. Upon winning, the traveller makes a unique wish for rice grains to be placed on a chessboard in a geometric sequence, doubling on each square. This wish illustrates the concept of exponential growth, as the total grains required exceed the kingdom's supply. The story highlights the importance of mathematics and strategy.

Explain the mathematical concept behind the traveller's wish for rice grains on the chessboard.

What lesson does the story of the Indian king and the traveller teach about exponential growth?