The Amazon’s Secret Soil That Still Beats Us

2,500 years ago, the ancient Amazonians created a soil so advanced that modern science still can’t replicate it. Known as terra preta, this "black earth" helped feed up to 20 million people in one of the least fertile regions on Earth. What secrets did they unlock beneath the forest floor? Discover how a so-called “primitive” civilization may have held the key to sustainable farming—and a forgotten science of life.

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