Your brain on LSD probably isn't the disaster Nancy Reagan wanted you to believe it would be. Can this drug which is currently illegal in the U., actually provides some mental health benefits? Learn more about the efficacy of LSD from this infographic.
How much does it hurt? Aching, throbbing, searing, excruciating – pain is difficult to describe and impossible to see. So how can doctors measure it? John Walsh finds out about new ways of assessing the agony.