University of Virginia students walk to fraternities at the start of rush week. Sorority women are always invited to Boys' Bid Night, but this year national sororities have ordered women to stay clear. Steve Helber/AP hide caption

itoggle caption Steve Helber/AP

They're members of the global-minded teens club: (left to right) Toluwanimi Sola-Adeyemi of Lagos, Chloe McGill of Seattle and Emine Arcasoy of Chapel Hill. Courtesy of Tolu Sola-Adeyemi, Chloe McGill and Emine Arcasoy. hide caption

itoggle caption Courtesy of Tolu Sola-Adeyemi, Chloe McGill and Emine Arcasoy.

Football rules, uniforms, helmets and protective gear have changed a lot over the years. Keystone-France/Gamma-Keystone via Getty Images hide caption

itoggle caption Keystone-France/Gamma-Keystone via Getty Images

The founder and chairman of Shake Shack, Danny Meyer, visits the floor of the New York Stock Exchange. Spencer Platt/Getty Images hide caption

itoggle caption Spencer Platt/Getty Images

The defending champion and favorite remains the chicken wing. But underdog snacks like the carrot are trying to elbow their way into the competition. Leif Parsons for NPR; Source: whologwhy/Flickr hide caption

itoggle caption Leif Parsons for NPR; Source: whologwhy/Flickr