A partially deaf gentleman was extolling the virtues of his new hearing
aid. "It's marvelous," he enthused to a friend. "Since I acquired it I can
hear the birds chirping on the hearth. I can also hear clearly a
conversation being held in an apartment a full block away!"
"You don't say," said his friend. "What kind is it?"
The proud owner consulted his wristwatch and answered, "Twenty minutes