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.
Let's start with the area code. The first digit has 8 possible numbers (2-9), the second digit has only 2 numbers (0 and 1) and the third can be all ten numbers (0-9). This gives us a total of 8*2*10, or 160 area codes. Each area code is followed by a three-digit number that can't equal the area code.