Presumably that would mean all 26 letters printed on top of each other. There's a silly old factoid about how "you only use 10 percent of your brain," which ps

Presumably that would mean all 26 letters printed on top of each other. There's a silly old factoid about how "you only use 10 percent of your brain," which psychics and other woo-peddlers use to sell their personal solutions for opening up the potential of the unused 90%. Of course the idea that you can think better if you use 100% of your brain at once is as silly as the idea that you can communicate better if you use 100% of the alphabet at once, which was Visarga's point. That's not what the article is talking about specifically, but the bit about "using your full brain" does raise unfortunate associations.