Have you ever tried to captivate you teenager’s attention on esoteric notions like global macro-economic issues ? Before giving-up : try this. Gapminder is specialized in animated graphical representation of various data. Not surprisingly the company was acquired by Google last year.
> see a representation of income per capita by country between 1975 and 2004, here. (Look at the tiny country thats falls sharply and bounces back : it is Rwanda).