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Solar water heating is one of the most common and cost-effective uses of solar energy . This same model may be applied to user-generated content sites , like Wikipedia , or the tens of millions of blogs in the blogosphere , where content that caters to hyperfocused topics generate cumulative levels of traffic greater than that for the top 100 blogs . Project CORRECT works to combine oral hygiene education with the behavior modification program already in place on the unit to promote greater oral hygiene awareness among the resident children . The post-consumer recycled content for regular construction steel varies between 25-56 % . Over your career , these plans along with Social Security and personal savings , will enable you to build a substantial , secure and reliable retirement income by the time you reach normal retirement age .