The use of evidence in arguments about bike helmets was evident in each of the videos, however, I felt the strongest use of evidence was in Fred Rivara’s Tedx Talk. He began by displaying a visual triangle chart and explaining that almost 800 people every year die from bicycling, 31,000 visit hospitals from bicycling, and over 500,000 visit emergency rooms from bicycling. Already, Fred is providing the audience with crucial evidence and even instilling a little bit of fear into listeners. He then goes on discussing a graph that shows 1/3 of emergency room visits from bicycling are due to head injuries, 2/3 of hospitalization visits are due to head injuries and ¾ that result in death are due to head injuries. These statistics are already demonstrating how important and necessary helmets are to bicyclists and Fred has yet to even discuss them. As he moves into talking about helmets, he explains how a series of studies were done through the Journal of American Medical Association and UW School of Medicine that demonstrated helmets effectiveness. The studies showed that helmets prevented 85% of head injuries and 88% of brain injuries. Fred used very informative evidence in his Ted talk as well as visual aids and it without a doubt enhanced his argument regarding the importance of bike helmets.