Why Aren't We Smarter Already? Evolutionary Limits on Cognition, University of Warwick and University of Basel Study  
12/8/2011 7:23:42 AM

We put a lot of energy into improving our memory, intelligence, and attention. There are even drugs that make us sharper, such as Ritalin and caffeine. But maybe smarter isn't really all that better. A new paper published in Current Directions in Psychological Science, a journal of the Association for Psychological Science, warns that there are limits on how smart humans can get, and any increases in thinking ability are likely to come with problems.