Mrs. Black had two coal fires in her house, and she always bought her coal from Mr. Matthews. He sold her good coal. There was never much dust in it.
But Mr. Matthews was old, and after a few years he stopped working in his coalyard, and his son Freddie began selling coal to Mrs. Black. He brought two sacks of coal to her house in his truck one day, and Mrs. Black said to him, ‘Your father always sold me good coal. There was never much dust in the sacks.’
‘I do that too,’ young Mr. Matthews said.
A few months later he brought Mrs. Black another two sacks of coal and said to her, ‘Did you find any dust in the last sacks of coal?»
‘No, I didn’t find dust in the sacks of coal, answered Mrs. Black. ‘I found some pieces of coal in the sacks of dust!’
