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Vast video library for many topics and subjects
PBS Frontline
Great documentaries on many topics.
Inside Story - Al Jazeera
Source of lively debates and incisive interviews on energy, food, population, inequality, climate etc.
Faultlines - Al Jazeera
Videos covering contentious issues
Top Documentary Films
There are categories for nature, environment, science, society, politics etc.
Source of good documentaries/case studies
Many different topics
UN Millenium Project
Lots of statistic and data that could be used in mathematics and social studies lessons
If it were my Home
Country comparison tool
Nation Master
Vast compilation of data from hundreds of sources