In 1920, a farmer plowing a field in Grootfontein, Namibia, hit a sudden roadblock below the surface of the soil. Curious about what had stopped his plow, the farmer dug around and found a very strange sight.
Beneath the soil was a giant slab of…

In 1920, a farmer plowing a field in Grootfontein, Namibia, hit a sudden roadblock below the surface of the soil. Curious about what had stopped his plow, the farmer dug around and found a very strange sight.
Beneath the soil was a giant slab of…