MIDWEST, Wyo. -- Eight years ago, the Salt Creek oil field here was pretty much played out. Every day, Salt Creek was using more energy to extract less oil out of the ground. There were estimates that this century-old field would be out of business by 2015. But then Anadarko Petroleum Corp., a Texas-based oil exploration company, moved in and plunked down $265 million to buy the company that owned the field. A few months later, big refrigerated tank trucks began showing up next to wells that were still producing. The trucks contained the magic ingredient that, when pumped down under pressure into one well, began to push up more oil into nearby wells. Go to story #1