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Scientists have developed a new type of fuel cell that can provide endless power through electricity harvested from dirt. A team from Northwestern University in the US say the book-sized unit could be used to power sensors used in farming, as well as remote devices in the Internet of Things (IoT). The technology works by generating electricity from naturally-occurring bacteria within the soil, offering a sustainable and renewable alternative to toxic and flammable batteries. "These microbes are ubiquitous; they already live in soil everywhere," said George Wells ... at Northwestern University. "We can use very simple engineered systems to capture their electricity. We're not going to power entire cities with this energy. But we can capture minute amounts of energy to fuel practical, low-power applications." The soil-based microbial fuel cell (MFC) is based on a 113-year-old technology first developed by British botanist Michael Cressé Potter, who was the first person to successfully generate electricity from microorganisms. It took until the 21st century for the first commercial applications to be proposed, with Foster's Brewing using a prototype to convert the yeast in brewery wastewater into electricity. The latest fuel cell was tested in wet and dry conditions to power sensors measuring soil moisture and detecting touch, outlasting the power of similar technologies by 120 per cent.

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