Incredibly speculative nonsense that people work on and gets published

Eyebrows and forehead brows. 

“The authors’ suggestion is an intriguing one, I think it remains speculative,” Ian Tattersall, the curator emeritus of human origins at the American Museum of Natural History, writes in an email.
And there are some important limitations to this study too. This work is the result of a computer manipulation of one skull that was missing a lower jaw. So the authors took some assumptions as to what the jaw would look and move like.