Graham Hancock explains how Terra Preta — Amazonian black earth — was actually made. It’s a man-made soil, created through “wet burning” of organic waste and composted material. Instead of burning fiercely into ash, ancient builders let it smolder slowly, forming a carbon-rich soil that still stays fertile after thousands of years. The part that still puzzles scientists? The microbial content — it’s unlike anything in modern soil, and no one fully understands how it formed or how it remains aliv