Could there be an equation for love? Scientists and mathematicians have long struggled to come up with one — but some believe that poets are better qualified to advise on romance.
Opposites don’t attract finds major study
Rare pair: The latest research shows that Beauty and the Beast were not well matched. Glossary
Traits - A person's characteristics or qualities.
Hormones - Chemicals created inside living creatures. They are used to send messages from one part of the body to another.
Electron - A negatively charged subatomic particle.