Familiar with any of these topics?
- Animals, Irrigation, Protein, Beeswax, Pathogens, Gardening
- Pollution, Environmental impact, Technology, Environment, Carbon dioxide
- Groundwater, Coal, Diesel, Fossil Fuel, Passive solar, Disease, Detergent
Connexions - CC licensed, wiki style educational material
TED - "Inspired talks by the world's greatest thinkers and doers," CC licensed
Humanity Development Library 2.0 appropriate technology database, unknown license,
Google Knol "A unit of knowledge," unknown license