Zeer pot fridge | Practical Action

Here is some cool innovative devices for:

keeping food cool - http://practicalaction.org/zeer-pots from others @ http://practicalaction.org/

cooking safely in Africa and elsewhere http://nickhorslen.blogspot.co.uk/search?q=500M

... to generating power from your sanitation output ie urine
http://nickhorslen.blogspot.co.uk/search?q=urine

enjoy the lateral thinking!!