Deep down, we all think we know what love is—right now, you’re probably thinking something like “a single soul inhabiting two bodies,” “love is patient and kind” or maybe even, “your love is my drug.”  When it comes to love, clichés and catchphrases abound—but do any of them really tell us what it is?  

So what is love?

New research is suggesting that love has a lot more to do with our heads than it does our hearts.  In her new book, Dirty Minds: How Our Brains Influence Love, Sex, and Relationships, science writer Kayt Sukel says love may be all in your head—and why breaking down the science doesn’t make it any less of a miracle.  

Here are 10 things I learned about love and the brain that will make you go hmmm…