Farmers weigh a giant sweet potato harvested from a farm in Tangyin County, Central China's Henan Province, Nov. 18, 2007. This root vegetable weighs more than 10 kilograms, surprising local villagers. (Source: newsphoto)

Farmers weigh a giant sweet potato harvested from a farm in Tangyin County, Central China's Henan Province, Nov. 18, 2007. This root vegetable weighs more than 10 kilograms, surprising local villagers. (Source: newsphoto) A girl holds a giant sweet potato harvested from a farm in Tangyin County, Central China's Henan Province, Nov. 18, 2007. This root vegetable weighs more than 10 kilograms, surprising local villagers. (Source: newsphoto) A girl holds a giant sweet potato harvested from a farm in Tangyin County, Central China's Henan Province, Nov. 18, 2007. This root vegetable weighs more than 10 kilograms, surprising local villagers. (Source: newsphoto)