For people with concussions, thinking is a bad idea. That’s the verdict from researchers at the Children’s Hospital of Philadelphia, who tracked the recoveries of 335 pediatric patients who had suffered concussions. The Atlantic reports that the researchers questioned patients about the degree of their cognitive activity, and placed them in one of four categories: full rest to mild activity, moderate activity, significant activity and full activity. The researchers found that patients who returned immediately to their pre-concussion, full levels of cognitive activity took an average of 100 days to recover from their symptoms, but patients in the lower three quartiles who took a break from cognitive activities recovered the most quickly, reporting no residual symptoms after 50 days. Read more in the Atlantic.