public static Logger log(){
  if (nervous_system == null)   nervous_system=new Logger("Heartbeat",Logger.ATTR_TIME | Logger.ATTR_COLOR);
  return nervous_system;
}

public static Logger log ( ) { if ( nervous_system == null ) nervous_system = new Logger ( "Heartbeat" , Logger . ATTR_TIME | Logger . ATTR_COLOR ) ; return nervous_system ; }
get the logger for the heartbeat
