You may not know the name Todd Mills, but he was and forever will be a great American hero. The 41-year-old Arkansas resident passed away last week after a battle with brain cancer, but without him, Americans would have never known the deliciousness that is a taco cradled in a shell made of Doritos. But Mills's contribution to society isn't just a tasty late night snack — his story is also about never taking no for an answer.

... In 2009, Mills had a brainstorm: Tacos with shells made out of Doritos. Even though he was just an average citizen, he pitched the idea to Frito-Lay ... and was told "Thanks, but no thanks." Undeterred from Frito-Lay's rejection, Mills started the "Taco Shells from Doritos Movement" Facebook page in 2009 to garner support for his idea. The goal was simple: get people talking about the tacos so much that Taco Bell or Frito-Lay couldn't ignore it. Three years later it happened.

... In 2012, Todd Mills received a phone call from Taco Bell. The company was developing the prized creation — calling it the Doritos Locos Tacos — and wanted to fly Todd out to its test kitchen in California. He was among the first people to try the new product.