It's the same site but if we compare urls: theadvancedapes:
DrMithrandir: http://www.newscientist.com/article/mg22029373.000-human-brain-boiled-in-its-skull-lasted-4000-years.html?utm_source=NSNS&utm_medium=SOC&utm_campaign=hoot&cmpid=SOC|NSNS|2013-GLOBAL-hoot#.Uk74H8aTwap
So, it looks like both articles are from the same site, but the first one seems to have been viewed through an intermediary, like for example facebook or whatever. I don't know that it's worth doing anything to the "submit" field, but it might be nice to cut down on the double sharing. http://www.newscientist.com/article/mg22029373.000-human-brain-boiled-in-its-skull-lasted-4000-years.html#.Uk74IsaTwao
Yep, so DrMithrandir would have had no way of knowing it had already been posted. It happens from time to time. As traffic increases, it will obviously happen more. Still, I don't foresee it being a big issue so long as people aren't intentionally reposting content. Then I may have to pull out my ignore stick on that mo-fo.
I thought I was been vigilant by checking #brain to see if this article was shared previously, but it seems I wasn't cautious enough. I apologise for reposting!
It's not a problem, it's inevitable to a degree. Thanks for actually taking the time to check the tag first.