It can be hard to figure out the facts when it comes to the contentious topic of Marcellus Shale drilling. Dr. Anthony Ingraffea, a professor of engineering at Cornell University, has done research and development for the oil and gas industry for 25 years. Last night he tried to separate myth from reality when it comes to hydraulic fracturing in a talk sponsored by the Sierra Club and Penn State Eco-Action on the Penn State University Park campus. WPSU's Emily Reddy talked with him earlier in the day yesterday.