ELI5 Hot Dogs - part of McDonald's founding story?

Why aren't hot dogs sold at fast food places, while burgers are everywhere? How are hot dogs part of McDonald's founding story? How does Joey Chestnut's body deal with 70 hotdogs in 10 minutes? Where did the name hot dogs even come from?   ... We explain like i'm five!   Thank you to the r/explainlikeimfive community as always and in particular the following users whose questions and comments formed the basis of this discussion: holyfruits, elan-morin-tedronai, coquetteclochette, msnewkicks, anothercarguy & nobirdsnobees. To the ELI5 community that has supported us so far, thanks for all your feedback and comments. Join us on Twitter: https://www.twitter.com/eli5ThePodcast/ or send us an e-mail: [email protected]