It’s easy to tell what color someone’s hair is, but figuring out the genetics behind how it got that way is anything but simple.

A new study from a team of international researchers analyzing 300,000 people of European descent finds more than 100 new genes related to hair color in some way. But even with their newfound knowledge, the researchers have only partial success predicting hair color based solely on genes. It’s a testament to the knotty genetics of pigmentation, but their researc