Harvard mathematicians have unveiled three questions that they say can determine whether a couple has the potential to stay together in the long run. Researchers say those three quirky questions are: "Do you like horror movies?" "Have you ever traveled around another country alone?" and "Wouldn't it be fun to chuck it all and go live on a sailboat?" The mathematicians say if you find someone that answers all three of the questions the same way you do, the two of you make the perfect match.