It’s Friday the 13th, and that means….

1. For some folks, National Geographic has found, Friday the 13th means a tough day at the store. “It’s been estimated that [U.S] $800 or $900 million is lost in business on this day because people will not fly or do business they would normally do,” said Donald Dossey, founder of the Stress Management Center and Phobia Institute in Asheville, NC, in an article on Friday the 13th.

2. So how did this all happen? According to Time magazine, some historians say it all began because 13 people attended the Last Supper. Others note, however, that the superstition dates at least to 1700 BC, as ancient Babylon’s Code of Hammurabi omits the number 13 in its list of laws.

3. Fridays have been considered unlucky since at least the 14th century, and Black Friday has been associated with stock market crashes since the 1800s.

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