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And so the question comes up, and it's come up for ages now, what made the modern human brain so different from our relatives, particularly Neanderthals, even the Deaf Sultans? Researchers at the University of California, San Diego, the School of Medicine there, as well as an international team, they discovered that ancient hominids, this would be including early humans and even Grade 8, came into contact with lead a lot earlier than previously believed, I think maybe up to 2 million years before modern humans began mining it. And this long-term exposure may have influenced how our early brains evolved, and maybe hindering language and social development in all but modern humans. And that's mainly because we possess a protective genetic variant, and the findings for this research is published in the Science of the Antisoces, back in much many days, October 15th. And so this is very, very recent research.