What is love?
I don't know why you're not there I give you my love, but you don't care So what is right? And what is wrong? Gimme a sign What is love? Baby, don't hurt me Don't hurt me no more Valentine's Day is the ideal opportunity for us, who talk science, to use the moment and write something on neurochemistry of love, passion, attraction, sex, and relationships. Why do we need love? Evolutionary biology has given us some answers: love, and more precisely, the connection between partners, is an important advantage for the Homo sapiens species, because the species' young grow up slowly, and their childhood and adolescence last a lot longer than with other species. So, the children need their parents much longer, and the child has the best chance of survival if both parents are present. Some species are monogamous, like a lot of birds species, and it's a rarity to see the pair 'separate', and if one of the partners...