The Science of Love and Betrayal

Falling in love is one of the strangest things we can do - and one of the things that makes us uniquely human. But what happens to our brains when our eyes meet across a crowded room? Why do we kiss each other, forget our friends, seek a 'good sense of humour' in Lonely Hearts adverts and try (and fail) to be monogamous? How are our romantic relationships different from our relationships...