It’s going to be a bit of a strange year for Friday the 13ths. First of all, there will be three of them. Now that’s not especially weird–it happens every few years–but it’s the first time since 1984 that they’ll be spaced precisely 13 weeks apart. It’s also the last time until 2040 that we’ll have three of them in a leap year. I got all this information from a story on the USA Today website, which featured some words from one Dr. Tom Fernsler of the University of Delaware, a math professor (naturally) who’s earned himself the nickname of “Dr. 13.” An interesting tidbit from the good doctor, and bad news for the phobic: the 13th of the month is actually more likely to occur on a Friday than any other day of the week–688 times in a 400-year period.