I wish they didn't use the word "horns" because this is probably going to cause some Christians to freak out.
Also, this isn't a bad thing, it's how our bodies work. Kids who do gymnastics or swim a lot have bodies that develop differently in response to those stresses.
Good call, that's exactly what they are. They buried all the actual science at the end of the article.
"The effect — known as enlarged external occipital protuberance — used to be so uncommon, Sayers said, that one of its early observers, toward the end of the 19th century, objected to its title, arguing that there was no real protrusion."
I guess we found a technological solution to this problem.