The ancestors of modern humans once had a very pronounced ridge on their brow, however, over time, our foreheads gradually became smoother and the eyebrows more visible and versatile.
The human jawbone, which still has teeth, is between 175,000 and 200,000 years old.
This new evidence will result in "a far more sophisticated appreciation" of our evolution.
The cache includes knives and spearpoints and the first giant hand axe ever discovered in the Arabian Peninsula.
The work shows "how important serendipity is for evolution."
We know how to find win-win situations.
"It might be small, but it might be very important. Because that's how it started, with one little bone. And it helps us to understand our origins."
Archaeologists made the discovery after digging up new regions in Spain.
The Dali skull is so old that archaeologists initially didn't believe it could share features with modern Homo sapiens.
In German, they'd call us "Spargeltarzan."
Skeletons of four, unrelated men offer major insight into the sex lives of our early ancestors.
The footprint is hugely controversial, but researchers say it must be considered in the debate of how and where our species emerged.
The skull belongs to a newly-identified species and comes from a period in evolutionary history where few fossils have been discovered.
How two hominins with Homo sapiens features ended up on other sides of Africa at a relatively similar time points to an immensely complex evolutionary history.
Highly controversial study places birthplace of hominin line outside of Africa, contrary to long held, popular thinking.
The discovery of more remains in a hard-to-reach cave raises more questions than it answers about Homo naledi and humans.
The discovery of ancient human remains in an important cave site in South Africa raises major questions about the evolution of our direct ancestors, Homo sapiens.
Ancient mastodon bones and stone tools found near San Diego suggest humans arrived in the Americas 115,000 years earlier than we previously thought.