Here are some resources to get you started:
Science, Health, and the Environment:
NPR – Science
BBC – Nature
BBC – Science and Environment
BBC – Health
VOA News – Science and Technology
VOA News – Environment
VOA News – Health
http://www.astronomy.com/
http://www.kidsastronomy.com/
NPR – Science
BBC – Nature
BBC – Science and Environment
BBC – Health
VOA News – Science and Technology
VOA News – Environment
VOA News – Health
http://www.astronomy.com/
http://www.kidsastronomy.com/
Arts, Entertainment, and History:
BBC – Entertainment and Arts
BBC – History
NPR – Arts
VOA News Arts and Entertainment
Three excellent resources are BBC News, NPR, and VOANews. Many of the articles on the VOA and NPR websites also have .mp3 files, so you can also use the articles as listening lectures.BBC – Entertainment and Arts
BBC – History
NPR – Arts
VOA News Arts and Entertainment