13 Facts About Friday the 13th

(via Mental Floss) There are plenty of superstitions out there, but none have woven themselves into the fabric of our culture quite like Friday the 13th. It’s inspired books, songs, and one of the most successful horror movie franchises of all time. But despite giving us anxiety, the origins of this notorious date on the calendar remain largely unknown to most. Where did it start? Does it really stretch back to the 14th century? And how does Loki figure into all of it? There are a lot of urban legends and half-truths out there, so we’re diving a bit deeper into the history of this most terrifying of days with 13 facts about Friday the 13th.