About 22% of the energy used in the U.S. comes from natural gas. There are about 300,000 miles of natural gas pipelines in the lower 48 states and 425,000 gas producing wells. The history of natural gas.
thru-hole. A circuit board packaging technique in which the leads (pins) on discrete components and chips are inserted through holes in the printed circuit board and soldered from beneath.
A dreamhole is a small slit or opening made in the wall of a building to let in sunlight or fresh air. It was also once used to refer to holes in watchtowers used by lookouts and guards, or to openings left in the walls of church towers to amplify the sounds of the bells.