Many online dating sites use algorithms to help you find your perfect match, but new research out of Northwestern University suggests that the math doesn’t add up. NU professor Eli Finkel gives Eight Forty-Eight the details of the report. OkCupid co-founder Sam Yagan and Me So Far’s Lakshmi Rengarajan also weigh in. To share your online dating stories, call 312-923-9239. Also, WBEZ history blogger John Schmidt recalls the 1936 killing of Machine Gun Jack McGurn, who may (or may not) have been connected to the St. Valentine’s Day Massacre. And singer-songwriter Anna Fermin stops by for an in-studio performance chat and reveals the secrets to writing the perfect love song.