Columbus’ Egg (コロンブスの卵 Koronbusu notamago?) is a test that is part of the Power Curriculum Program, that is used to test espers, spefically, Telekinetic espers. It is named after the popular story of how Christopher Columbus, having been told that discovering the Americas was no great accomplishment, challenged his critics to make an egg stand on its tip.
Like in the story, the esper is required to balance a raw egg upside-down in a surface without any support. Even a student who studies telekinesis has to work so hard that the blood vessels in their brain would explode in order to prevent the egg from falling; this is because if the force is too great, the egg will break.
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