VOA Special English: Bright Idea: Light Bulbs From Plastic Bottles, Water and Bleach level = 11 2:54 on 2012/03/18
VOA Special English: A Star Explodes, and Astronomers Make a Quick Discovery level = 10 2:57 on 2012/03/11
VOA Special English: Great Thinkers: Charles Darwin and Evolution (Part 3/3) level = 11 4:52 on 2012/03/09
