When it comes to affairs of the heart, there are a variety of factors at play: mutual attraction, shared interests, an intangible spark that eventually leads to love. But in Darwinian terms, the ...

This story originally appeared on Massive Science, an editorial partner site that publishes science stories by scientists. Subscribe to their newsletter to get even more science sent straight to you. ...

As you begin to see nests full of baby chicks and fledgling birds hopping around in your backyard, you may wonder: how do birds mate? The answer is actually different from what we’ve come to expect as ...