Sources

www.sciencedaily.com

http://health.usnews.com/health-news/articles/2015/06/17/too-much-feel-good-brain-chemical-may-trigger-social-phobia

http://www.telegraph.co.uk/news/science/science-news/10486479/Phobias-may-be-memories-passed-down-in-genes-from-ancestors.html

http://psychcentral.com/news/2015/07/06/recurrent-depression-linked-to-smaller-hippocampus/86512.html

http://www.independent.co.uk/arts-entertainment/comedy/news/you-don-t-have-to-be-psychotic-to-work-this-crowd-study-finds-comedians-are-more-inclined-to-suffer-9062672.html