If you live in an earthen structure, maybe you can power this mud clock with it.
Quake Safe
Quake Safe is a frame made from string, bamboo and wire, which can be either retrofitted into an existing adobe (mud brick) house or incorporated into a new house as it’s being built, in order to give it a much higher level of structural protection against earthquakes. The invention was created by Faculty of Engineering Ph.D Student at the University of Technology in Sydney, Dominic Dowling.
The frame is designed to be affordable to people who live in adobe houses, particularly the poorer rural communities of Central America.
[ interview | video ]
Earthen Refrigeration
In a region where electricity is nonexistent and traditional clay pots are being replaced by aluminum and plastic containers, Mohammed Bah Abba has invented a clay pot in pot refrigeration system that, through evaporative cooling, dramatically extends the shelf-life of food.