Cave paintings in Spain were made by Neanderthals, not modern humans, archaeologists reported.
The finding adds to evidence that Neanderthals were capable of symbolic thought and perhaps language.(Carbon dating is already limited in scope because older artifacts have to be dated using other methods. The ratio of these carbon isotopes reveals the ages of some of Earth's oldest inhabitants. Radiocarbon dating radioactive carbon decays to nitrogen with a half-life of 5730 years.
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