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
Genetics - A branch of science that studies genes. Genetics can include looking at how some diseases are passed down the generations, like cancer or heart problems.
Hormones - Chemicals created inside living creatures. They are used to send messages from one part of the body to another.
Testosterone - The hormone that causes people to develop male sexual characteristics. Women also produce some testosterone.
Oestrogen - Female sex hormones. After the menopause, these can increase the risk of cancer.
Serotonin - A chemical messenger believed to boost people's mood.
Dopamine - A hormone and neurotransmitter that plays several important roles in the brain and body, providing us with positive sensations, rewarding us for evolutionarily good behaviours like eating food.
Norepinephrine - A hormone that plays a role in the body's "fight or flight" response.
Electron - A negatively charged subatomic particle.
Relativity - A theory stating that space and time are relative to each other.
Quantum mechanics - A fundamental theory in physics describing the properties of nature on an atomic scale. Unlike general relativity, which works when applied to large objects, quantum mechanics helps describe the world on a tiny level - at a scale where things can be in several places at once, and measurement can affect reality.