Question: An egg of Columbus or Columbus' egg, refers to a brilliant idea or discovery that seems simple or easy after the fact, the expression refers to an apocryphal story in which 1492, a Spanish-based transatlantic maritime expedition led by Christopher Columbus encountered the Americas, a continent which was previously unknown in Europe, leading to the colonization of the Americas?
Sentence (from "Egg of Columbus"): After his challengers give up, Columbus does it himself by tapping the egg on the table to flatten its tip.
Relevant evidence: No