Uh oh, it's Friday the 13th. We’ve been told it's a very unlucky day. So why is it so scary for us? One explanation is that Friday and the number 13 both have violent historical connections to ...

Add Yahoo as a preferred source to see more of our stories on Google. For some, the number 13 is considered unlucky. But for Taylor Swift, the number 13 has been bringing her good fortune since birth.

Triskaidekaphobia is an excessive fear of the number 13. There is some debate about whether this fear fulfills the criteria of a specific phobia. Certain cultures consider the number 13 unlucky. In ...

For some, the number 13 is considered unlucky. But for Taylor Swift, the number 13 has been bringing her good fortune since birth. The pop icon, born on Dec. 13, 1989, has a special connection to 13 ...