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Pocket Geiger Unit

Small Geiger-Müller (G-M) tubes make ideal sensors for pocket-sized devices to detect radioactivity. However,  even a small G-M tube needs an anode voltage in the 400 to 600 volt region. Here's how to generate that voltage from a 9 V battery.

The Edison Cell

With the wild fluctuations in fuel prices over the last few years, world concern over global warming, and simply the idea of creating new and more sustainable technologies, immense interest and progress has developed recently in the world of battery development.