Scientists believe that analysis of earwax can provide information about a person's mental health.   Thirty-seven people took part in the study, which found that fluids around your eardrum could be used to determine the formation of the stress hormone cortisol. According to Dr. Andreas Hernandez, lead author of the study, it could open up new avenues for better diagnoses of other mental illnesses, including depression. They have also developed a new type of swab that will not damage the eardrum. Cortisol is known as the fight or flight hormone. When it sends an alarm signal to the brain in response to a stress, it can affect almost every system, from the immune system to digestion and sleep. But its role in diseases such as anxiety and depression has not been fully elucidated. University College London Institute of Cognitive Neuroscience psychologist Dr Hernandez wants to understand what high or low cortisol levels mean.   Although the research is still in its infancy, they hope it