The Haya people of Tanzania were producing carbon steel in the year 100 AD, nearly 1,900 years before the process was independently developed in Europe. Their furnaces reached 1,800 degrees Celsius using preheated forced-draft technology that European metallurgists did not achieve until the Industrial Revolution. When anthropologists arrived to study it in the 1970s, the knowledge only survived because a few elderly men still remembered it. Cheap European steel had already put the Haya out of business decades earlier.
Africa did not need to be taught how to build. It needed to be left alone.
What historical fact sounds fake but is true?