Today is Friday the 13th, an occurrence that happens only a couple of times a year. The day has come to be associated with superstition, luck and magic, though it has some surprising origins.

Remember all the things you'd do to get a better chance of having a snow day? Here are nine of those superstitions.

Maybe you have to tap the plane three times as you board. Maybe you can't watch your beloved Eagles play without wearing your lucky (and desperately in need of washing) green socks. Maybe you're ...

Today is Friday the 13th, an occurrence that happens only a couple of times a year. The day has come to be associated with superstition, luck and magic, though it has some surprising origins.