As of May 2014, the price of a Forever stamp costs 49 cents. This  price comes after several price increases of stamps. It was last  known to cost 46 cents.
A trench is a type of excavation or depression in the ground that is generally deeper than it is wide (as opposed to a wider gully, or ditch), and narrow compared with its length (as opposed to a simple hole). In geology, trenches are created as a result of erosion by rivers or by geological movement of tectonic plates. In the civil engineering field, trenches are often created to install underground infrastructure or utilities (such as gas mains, water mains or telephone lines), or later to access these installations. Trenches have also often been dug for military defensive purposes.
A trench is a deep and narrow hole, or ditch, in the ground, like the kind soldiers on frontlines might dig to give themselves shelter from the enemy. A natural trench may also be a deep hole on the bottom of the ocean. The verb trench means to dig or to cut into, but you will most often hear the word as a noun, particularly relating to soldiers. The phrase trench warfare became popular around World War I, when technological advances in weapons changed the way that wars were fought.