In this ABC News program, SuperFreakonomics authors Steven D. Levitt and Stephen J. Dubner give the concept of cause and effect a whack on the head. In a whirlwind round of 20 questions, Levitt and Dubner make forays into the worlds of business, education, health care, environmental science, and psychology to shed light on how a doctor’s necktie can harm patients, why emergency rooms should be located at airports, how lasers could reduce the spread of malaria, a connection between the birth control pill and fewer teachers in America’s public schools, a disconnect between locally grown produce and carbon emissions, how a garden hose to the stratosphere could cool down the Earth, the enticing economics of being a high-end call girl, and much, much more. Original broadcast title: 20 Questions You Never Thought to Ask. (39 minutes)