Paleontologists can rediscover the forgotten wisdom of our ancestors. For example, the Nabatans occupied the sinister Negev desert two thousand years ago, and they channeled rainwater from heavy rains that rarely occur in this area to irrigation canals and reservoirs. This method was used to rebuild ancient farms in the area, which now also produce high grain yields. The term "method" in a paragraph refers to:. ['The Nabatas occupy the sinister Negev desert.', 'Nabatans build irrigation canals and cisterns.', 'Nabata irrigate with heavy rainwater.', 'Rebuilding ancient farms in this area.']