like calculus like a complicated form it wasn't algebra and too many factors that go into determining whether this works or doesn't work. for me to be able to come up for e me to be able to weigh believers to skeptics to come up with an answer and other part of it was humbling is that look at the history of fracking everybody has tried to predict it has been wrong and, in fact, looking at the history of oil predicting in trying to predict future direction of oil prices almost everybody who make prediction is wrong back to fears of peak oil in 1970s and 1980s. so i also profiled another company in my book a company located here called eog resources which people called harvard of shale or apple of shale with a flip side flip counterpoint to chesapeake as companies that shows that this business can be done. and at least sort of financially sound way. but what i would say is that there's reason to be worried about the industry. because to me the key question is how real is this revolution