A gun muffler comprises an elongated housing which is lined with a sound absorbing foam. The wind park includes at least one wind turbine; a transformer coupled between the at least one wind turbine and a power grid. If a size of the e-mail messages reaches a predetermined limit of the memory, e-mail message bodies of some of the e-mail messages are automatically deleted from the memory while e-mail message headers of the e-mail messages are retained. Particular embodiments of the compositions are environmentally friendly.