So in my current story, which is a fantasy, people have the power to manipulate nature force to perform some tasks or actions. That's the main plot, it revolves around these powers and how or why some people have the ability to master it while others fail. Anyway, I've been looking up some stuff about this and I have two questions. 1. Has it been scientifically proven that people use only 7%, 10% of their brains? I've tried to look it up but it's so confusing as some claim it's a myth. 2. There's this guy called Edward Leedskalnin, who's now deceased, and he claims that he built the Coral Castle all by himself using the natural forces to aid him lift the stones, which weighed tons sometimes. Is this true? Has it been proven? and is it possible for me to mention him in the story? Maybe as the person who started this thing or do I need to get permission or something? Thanks!