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.
Hernia (Definition) A hernia is a hole in the abdominal wall thru which the inner lining protrudes thru, creating a sac. Organs from within the abdominal cavity, such as the intestine, can protrude thru the hole and get stuck in the sac. Many hernias develop during fetal life and become evident in childhood or as an adult.