Real life tragedy and drama topping a list of the most powerful TV moments of the past 50 years. Nielsen and Sony electronics conducted the survey. The top five moments on the survey are: * September 11 terrorist attacks * Hurricane Katrina * O.J. Simpson verdict * Challenger space shuttle explosion * Death of Osama … Continue reading 9/11 attacks, O.J. Simpson verdict top list of powerful TV moments in last 50 years