Anna Machin. is an evolutionary anthropologist, writer and broadcaster whose work has appeared in the New Scientist and The Guardian, among others. She is the author of The Life of Dad: The Making of the Modern Father (2018) and Why We Love: The New Science Behind our Closest Relationships

Love is a form of biological bribery, a cunning evolutionary trick to make sure we cooperate and those all-important genes continue down the generations

The joy it brings is wonderful but is merely a side-effect. Its goal is to ensure our survival, and for this reason happiness is not always its end point.

Jealousy is an evolved response to threats to our reproductive success and survival – of self, children, and genes

In many cases, it is of positive benefit to those who experience it as it shines a light on the threat and enables us to decide what is best. In some cases, jealousy gets out of hand.

Evolution saw fit to give us love to ensure we would continue to form and maintain cooperative relationships that are our route to personal and, most crucially, genetic survival

Love is merely the sweet treat handed to you by your babysitter to make sure the goal is achieved

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