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The discovery of a 400,000-year-old half skull in Portugal has offered tantalizing hints about a possible ancestor of the Neanderthals, researchers said Monday.The fossil was unearthed from the Aroeira cave site, and marks the oldest human cranium fossil ever found in Portugal, said the report in the Proceedings of the National Academy of Sciences, a peer-reviewed US journal.But there is plenty of mystery around the skull. Researchers don't know if it was from a male or female, how the person died, or even what form of early human it was.