Is it just me, or is everybody out there looking for a quick fix? There is something highly compelling about the idea that there is a secret switch we can flip to become suddenly smarter, to reveal cognitive abilities hidden inside each of us. Over just seven years, the games-maker Lumosity rocketed from zero to 50 million users, promising rapid improvements in general intelligence by playing brain-training video games for just a few weeks.
So, is there anything out there that works?
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