Drive past a Pizza Hut and you'll immediately recognize the red roof. It's a design choice that dates back to the 1970s, and it all started with a logo change.

Some logos are nothing short of iconic. You know the classics: McDonald's, Taco Bell, and KFC ... their designs are recognizable in a heartbeat. According to the CDC, 32% of adults in the U.S.

Fast-food logos rarely stay the same. Over the decades, each redesign has mirrored shifts in design trends and customer expectations. The updates reveal how these chains want to be recognized—whether ...

Add Yahoo as a preferred source to see more of our stories on Google. In and Out Burger sign - Jon Hicks/Getty Images There's a science happening right in front of our eyes as we walk down the ...