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.
The Official Baseball Rules govern all professional play in the United States and Canada, including the World Baseball Classic. The complete rules are published as the Official Baseball Rules at MLB.com, the official web site of Major League Baseball in the United States and Canada. The rules are also published in book form in North America by the Sporting News.