Who were the Zapotec? Central American history
A Zapotec head The Zapotec civilization, like the Maya, grew up in the region that had been ruled by the Olmec, after the collapse of Olmec power about 500 BC. The main city [...]
9
09, 2017
17
08, 2017
Wheel and axle – Simple machines – Physics
An Egyptian potter uses a pottery wheel, about 2000 BC. He uses his hand to spin the wheel. Wheels do not exist in nature, and no animals use them except [...]
