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Deep in the Amazon, scientists discovered patches of black soil so fertile they've remained productive for over two thousand years—without a single application of chemical fertilizer. For decades, Western researchers dismissed it as a natural anomaly because they refused to believe indigenous people had developed a technology superior to modern chemistry. That soil is Terra Preta, a man-made "dark earth" created by ancient civilizations using a Slash-and-Char technique that produces Biochar—a porous charcoal structure housing billions of microbes that locks nutrients into the ground permanently. Unlike industrial farming that depletes land within a few harvests, Terra Preta actually grows itself, expanding up to one centimeter per year as the microbial colonies reproduce. We ignored a self-regenerating soil battery in favor of a system that requires you to buy new chemicals every spring. Learn to make Biochar in your backyard, and you can stop buying fertilizer forever.