The maize munchers

 作者:哈萘     |      日期:2019-03-07 10:04:01
By Jonathan Knight PEOPLE first cultivated maize much earlier than previously thought, say archaeologists who’ve been studying the oldest cobs unearthed so far from caves in southern Mexico. The prehistoric specimens suggest that maize’s wild ancestors were domesticated at least 6500 years ago. But we may never know where the first corn grew. Maize is one of the world’s most important crops. And researchers think ancient Central Americans created it by breeding desirable traits into a wild annual grass called teosinte. The grass produces wheat-sized clusters of grain,