CDC public service announcement. A PSA from the CDC regarding H1N1 prevention. A public service announcement (PSA) or public service ad, are messages in the public interest disseminated by the media without charge, with the objective of raising awareness, changing public attitudes and behavior towards a social issue.
This article includes a list of references, related reading or external links, but its sources remain unclear because it lacks inline citations. (May 2015) (Learn how and when to remove this template message) Isolated Power or ISO is a sabermetric baseball statistic which aims to measure a batter's raw power. The formula is slugging percentage minus batting average. The final result measures how many extra bases a player averages per at bat.
A regulation game consists of nine innings in Major League Baseball (MLB) . The visiting team bats in the first half of each inning, called the top of the inning.. The home team bats in the second half of each inning, called the bottom of the inning.. An inning continues until the defense gets three outs. There is no time regulation for an inning. If the game is tied in the ninth inning, it goes into extra innings and continues until one team holds a lead at the end of an inning. To score a run, a base runner needs to touch all four bases, in the sequence of 1st, 2nd, 3rd, and finally home base.