Everyone's afraid of something. Whether it's bears or bats, public speaking or the dark, our fears betray an ancient, gut-level response that's hard to understand and even harder to address. This magazine dives into a dizzying array of morbidly entertaining fears and phobias, from common ones like acrophobia (fear of heights) and arachnophobia (fear of spiders) through odder entries like triskaidekaphobia (fear of the number 13), and we'll explore the sources of our fears, and our most promising treatments.