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Homo heidelbergensis possessed a large browridge and a bigger braincase and flatter face than earlier hominins - species on the human evolutionary lineage.

“We don’t have the frontal bone, browridge, face, teeth or chin region, any of which could have been less ‘modern’ in form,” he said in an email.

Around when Charles Darwin's theory of evolution was published, scientists were puzzled by ancient human bones discovered in 1856 Germany that featured a prominent browridge.