The exterior of the speaker sits flush with your drywall, giving it a sleek and smooth appearance. Once your in-wall speakers are in place, you can connect it to the power and amplification sources to get that rich, deep sound you want in your outdoor space.
Drying oils will change from liquid to a solid film when exposed to oxygen in the air. Nut oils (boiled linseed, tung, etc.) are drying oils, but vegetable (peanut, olive) and mineral oils are non-drying. Edible mineral oil is popular on food contact items, like cutting boards. However, non-drying oils stay wet indefinitely, and they will wash off when the board is scrubbed with soap and water. Because they do not dry to a solid film, non-drying oils are considered a wood treatment, but not a finish.
Olive oil doesn't just make food taste better. The unsaturated fats found in olive oil (and canola and walnut oil) have the added benefit of helping to cut LDL cholesterol levels without affecting HDL. Aim for about 2 tablespoons a day in place of other fats.