OCEANSIDE, Calif. (CNNMoney) — From the outside, it looks like a crash-landed blimp. On the inside, it feels like a wind tunnel. For inventor David Chelf, this strange structure — a high-tech greenhouse with no skeleton, whose lightweight skin is held aloft on breezes from giant fans — looks like the future of agriculture. “I knew nothing could grow without airflow,” Chelf explains. “And I thought if I could work …Read More