"He'd noticed that his grandson was working too hard, and he was the one who told him about the marbles. He told it this way. He said that the average life span for men was around seventy-five years. That meant thirty-nine hundred Saturdays--to play when you were a kid and to be with your family when you got older and wiser." "I see," I said. "Or to play once you got older. Or even to give lectures to anyone who'll listen." "Shush, Alex. Now, listen. So the grandfather figured out that his grandson, who was forty-three, had about sixteen hundred and sixty Saturdays left in his life. Statistically speaking. So what he did was he bought two large jars and filled them with beautiful cat's-eye marbles. He gave them to his grandson. And he told him that every Saturday, he should take one marble out of the jar. Just one, and just as a reminder that he had only so many Saturdays left, and that they were precious"