These ancient human relatives include the first species with evidence of upright walking and running like humans. They represent more than a third of our evolutionary history.
Gerrit van den Bergh and coworkers describe dental remains and a jaw from Mata Menge, 700,000 years ago.
I look at views expressed by Jeffrey Schwartz and Tim White about the anatomy of Homo naledi and its relationships with other hominins.
A big argument about the so-called savanna theory comes with a surprising claim about the earliest possible hominin fossils.