He probably used basically 100% of it – and the good news is you do too! Lots of people say we only use 10% but that’s not really true. Your brain has to do way more jobs than we usually think and virtually everyone uses almost all of it over the course of a day! I found this article helpful when I started thinking about this https://www.scientificamerican.com/article/do-people-only-use-10-percent-of-their-brains/
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