“While iron oxide makes up over 6% of the Earth’s crust, it took a long time for mankind to figure out how to convert dirt into something as useful as steel. The first smelting of iron from ore was probably… — Anonymous Copy Share Image
“One party went to far away Zimbabwe and returned with pack-oxen loaded with ivory, rhinoceros hides, lion skins and hog tusks. They reported finding a people whose women dug the mountain sides for nuggets and brittle stones, which they brought… — Sol T. Plaatje Copy Share Image
