This story appears in the April 14, 2014 issue of Forbes. On one of the windiest days in recent memory Harry Stine, the richest man in Iowa, cranes his neck to examine the elevator shaft inside the 110-foot steel observation tower next to his garage. “The cables look awfully frayed. Who knows if it will last one more time?” he chuckles. Nonetheless, we hop into the elevator cab, he flips the switch to get it moving, and up we go as the wind rips into us at 40mph. Stine, the 72-year-old founder and owner of Stine Seed, the largest private...