Pandemic smallpox was responsible for 300–500 million deaths. As recently as the early 1950s, an estimated 50 million cases of smallpox occurred in the world each year. After successful vaccination campaigns throughout the 19th and 20th centuries, the WHO certified the eradication of smallpox in December 1979. To this day, smallpox is the only human infectious disease to have been completely eradicated, and one of two infectious viruses ever to be eradicated. Historically, measles was prevalent throughout the world, as it is highly contagious. According to the U.S. National Immunization Program, 90% of people were infected with measles by age 15.
Trying to Be Cool video, which was directed by CANADA and produced by The Creators Project, was released on YouTube on 2 July 2013. The music video includes a "surprise" made every 20 seconds. The version of the song used in the music video is more guitar-driven and less synthesizer-driven than the album version. In addition, the video version is a medley with "Drakkar Noir." This combination has become the typical live-performance of the song for Phoenix's concerts. "Trying to Be Cool" was used in one episode of MTV series "". "Trying to Be Cool" was used in a season one episode of Multishow