The science of pink and blue

At The Conversation, neuroscientist Melissa Hines talks about what little biological basis there is behind the idea of heavily gender-coded toys for children. It's true that male and female fetuses are exposed to different hormones before birth and that might affect what kinds of toys they're interested in later. But it's also true that there is natural variability in both hormone levels and interests within the sexes and (intriguingly) human babies all prefer reds and pinks, regardless of their sex. (Meanwhile, human adults prefer blue colors, regardless of sex.)