For generations, we've been taught that women are more sensitive and emotional, whereas men are more aggressive and sexual. But is it actually true? According to neuroscientist Daphna Joel, every individual human brain is actually a unique mixture—or mosaic—of "male" and "female" features, which don't map neatly into two categories. Joel argues that this has urgent practical implications for the way we understand the world around us, and how we understand each other.