A study conducted by the Evolution & Ecology Research Centre has taken the guessing game out of what beard style women prefer. We visited Astor Place Hairstylists to get some tips on how to keep up the popular yet subtly maintained 10-day beard. Produced by Alana Kakoyiannis. Follow BI Video: On FacebookNOW WATCH: You've Been Rolling Your Shirtsleeves Wrong Your Entire Life Join the conversation about this story »