Largest fast-food chains: “The Most Popular Fast Food Restaurants in America,” Business Insider, July 12, 2012.
Wireless market share: US Wireless Data Market Q1 2011 Update, Chetan Sharma Consulting, www.chetansharma.com
Total number of marathons in the United States: www.MarathonGuide.com
Total number of Nike shoe models produced: www.Solepedia.com
Largest and smallest universities and colleges in the United States: Individual university websites and TopTenz.net