New research published in the journal Nature Ecology & Evolution contributes to a long-running debate about why archaic hominins had gigantic brow ridges while anatomically modern humans evolved flatter foreheads. A Homo heidelbergensis, a Neanderthal and a Cro-Magnon. Image credit: SINC / José Antonio Peñas. Like the antlers on a stag, a pronounced brow ridge was a permanent signal of dominance and aggression in our ancestors, which anatomically...