21.   The MacDonalds box has a useful life of only several minutes, but languishes for decades in litter or landfill.

22.   And when the police car has ended its useful life on the force, you may find yourself sitting in its back seat as a taxi passenger.

23.   Bacteria can gain resistance to antibiotics over time, and needless prescriptions shorten the useful life of the drugs.

24.   Advertising, and the industries it serves, has fostered a culture of waste in which rapidly changing styles render products obsolete long before their useful life is extinguished.

25.   But even Russian officials have begun to fret that the Mir is approaching the end of its useful life.

26.   Buying the fastest processor available may prolong the useful life of the computer, but not by that much.

27.   Concrete cannot currently be delivered to Manhattan because inspections of the delivery trucks outlast the useful life of the product.

28.   Depreciation and amortization are accounting methods that deduct from revenue the cost of business equipment over its useful life.

29.   Duke, however, hopes to extend the useful life of existing plants well into the next century.

30.   For years, the Red Sox have said Fenway was nearing the end of its useful life structurally and economically.