Scientists have identified a previously unknown human relative from a 1.4-million ... However, doubts about its unusual jaw shape and tooth structure persisted for decades. To reassess SK 15 ...

Human evolution is often seen as a slow process ... contributing to smaller jaws and jaw muscles. As a result, many people ...

And yet, its humerus (an arm bone) is quite human-like. Characteristics ... to back on the top of the skull) from which muscles running to the jaw were attached. A. boisei is similar to A.