URL	Title	Id
http://digfir-published.macmillanusa.com/astro_interactive_exercise/ie_the_drake_equation.html	Chapter 1. The Drake Equation	51413a45b11c0f181b000023
http://digfir-published.macmillanusa.com/astro_interactive_exercise/ie_the_drake_equation_dlap.xml	DLAP questions	51413a45b11c0f181b000023