The tanks in Cushing, Oklahoma, are hitting bottom. The oil market is about to hit a tipping point

By David Goldman, CNN (CNN) — Cushing, Oklahoma, dubs itself the pipeline crossroads of the world. The tagline is emblazoned on a giant roadside sign fashioned out of pipes on the corner of Main Street and South Stiles Road. It has a valve and everything. But it’s not just a slogan. In 1912, Tom Slick