According to the most recent data from the World Bank, 15 percent of the world’s population—approximately 1.1 billion people—lacked access to electricity in 2014. In 1994, approximately 27 percent of ...

A solar day lamp is a simple, inexpensive device for bringing “daylight” to dark interior spaces whenever the sun is shining. This article provides complete instructions for designing lamps using both ...

‘Understanding the physical craft is a big part of understanding how to move to sustainable energy’ ‘Understanding the physical craft is a big part of understanding how to move to sustainable energy’ ...

Thermoelectric coolers are a neat (although potentially energy-expensive way) to cool devices such as solid-state lasers and even high-performance processor chips. This current Design Idea, Use ...