National Geographic : 2015 Jun
37 Marijuana grows in an irrigated field on the plains east of Denver—discreetly hidden behind rows of corn. This crop is hemp, a nonpsychoactive variety with little tetrahy- drocannabinol (THC). Its tough fiber has long been used for rope, paper, and fabric, but it’s also rich in compounds with medical promise. Some of this harvest will be used to make CBD oil, which is in such demand to treat children with seizures that cannabis growers have stepped up production.