VOA Special English: Great Thinkers: Charles Darwin and Evolution (Part 3/3) level = 11 4:52 on 2012/03/09
VOA Special English: Great Thinkers: Charles Darwin and Evolution (Part 2/3) level = 10 4:29 on 2012/03/09
VOA Special English: Great Thinkers: Charles Darwin and Evolution (Part 1/3) level = 11 3:26 on 2012/03/09
VOA Special English: Working to Protect Plants for Future Generations (Part 3/3) level = 10 4:25 on 2012/03/07
VOA Special English: Working to Protect Plants for Future Generations (Part 2/3) level = 10 4:14 on 2012/03/07
