Here’s a familiar story. Two large oak trees had fallen across Bob’s front lawn during a huge thunderstorm the previous evening. Deciding to cut them up for firewood, Bob went to the local hardware store to purchase a chain saw.

“I need the best chain saw you have,” Bob told the store manager.

“Yes sir,” said the manager. “This one here will cut up to ten cords of wood in an eight-hour work day.”

“I’ll take it,” Bob replied, “I need to get those trees off my lawn and turn them into fireplace fuel for next winter.”

As Bob was leaving the hardware store with his new purchase, the manager reminded him, “Remember, be sure to keep it filled with the right mix of oil and gasoline.”

“I know, I know all that,” Bob responded, in a hurry to get home and start cutting wood.

“And don’t forget to…