Other
Stadt Koln
A great web site, the official site of the city of Koln (Cologne) contains a wealth of information about the city: facts and figures, its history, culture, geography, economy, sights, tourism, sports, and free time activity--not to...
TeachEngineering
Teach Engineering: A Matter of Leaching
Students leach organic matter from soil to create a water sample with high dissolved organic matter content (DOM), and then make filters to see if the DOM can be removed. They experience the difficulties of removing DOM from water, and...