Commotio cordis. Commotio cordis (Latin, agitation of the heart) is an often lethal disruption of heart rhythm that occurs as a result of a blow to the area directly over the heart (the precordial region), at a critical time during the cycle of a heart beat causing cardiac arrest.
A ZIP Code is a five digit number that identifies a specific geographic mail delivery area. The acronym ZIP refers to Zone Improvement Plan, a plan implemented by the USPS in the early 1960âs to improve the sorting and delivery of mail. There are approximately 43,000 ZIP Codes in the United States.
Facing a shortage of telephone numbers -- ''number exhaustion'' to use the industry term -- regulators are adding area codes at a furious pace. Since 1995, 138 area codes have been added around the country, raising the national total to 344. Between 1984 and 1994, the nation made do by adding only nine.