This week we’re on a mission to understand phobias, manias and obsessions! We look at where our phobias come from, how people use obsessions as a coping mechanism and how you define a phobia. We also find out about a fascinating case of ‘dancing mania’, we consider the evolutionary purpose behind phobias and we look at how our fears have changed over time.

Special thanks to today's expert, Kate Summerscale.