Practical Action (http://practicalaction.org/) is amongst my favourite educational charities.
The simplest technologies can have the biggest impact...
Practical action is concerned with Technology Justice - they enable developing communities to fulfill their potential by using technology to solve practical issues surrounding poverty.
The Wind Power Challenge requires students to think about the efficiency of sustainable power generation.
My students loved designing and creating their own wind turbines. Varying shapes, sizes, weights and materials were considered in the process. A small hair dryer provided us with wind, the students provided the endeavour and engineering skills!
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