Duolingo is the world's largest online language learning platform. It was recognized as Apple's iPhone App of the Year of 2013 as well as Google Play's Best of the Best of 2013 and 2014. Duolingo's adaptive experience has gamified elements to make language learning more fun and effective. 200 million students are learning a language with Duolingo.
Definition of waffle. : a crisp cake of batter baked in a waffle iron.
Still, waffles were to remain a fringe food until they became easier to make. In 1869, Cornelius Swartwout of Troy, New York patented the first stovetop waffle iron [PDF]. Made from cast iron, it had a hinged top and handle made to cook waffles quickly and without burning hands.