Origin of sweet potato
The sweet potato does not originate from South-America as does the normal potato. The sweet potato was found in a valley that was unknown in the world till the second world war. Over this valley, an American plane flew during its discovery. It happened on the island of New Guinea and the valley is called the Balim valley. There they discovered a civilization of Papuan people who grew 50 kinds of batatas as this tuber was originally called. There are white, purple, orange and, yellow varieties.