Before the dawn of the 20th century, humans were stuck in the Stone Age. Literally. They were stuck in stone. It was a real thing.
But seriously, the early years of human history were marked by the rise of agriculture, the wheel, and other innovations that would make our ancestors proud.
The wheel: a marvel of medieval engineering. A circle of wood or stone that would make our ancestors' lives easier. And also make them question the meaning of life.
Inventions of the Ages Stone Age Problems