There is an old story about the Touchstone, a small black pebble that could turn common metal into pure gold.
The Touchstone was located on the shores of the Black Sea, lying among thousands of other pebbles which looked exactly like it. But there was one physical difference between the Touchstone and an ordinary pebble: the Touchstone would feel warm while the ordinary pebble was cold.
One day a man, who had heard the story about the Touchstone decided to sell his belongings, buy some supplies and a tent, and dedicate his time to trying to find the Touchstone.
So he set up camp and began to p...
