Summary: Scientists have now detected D-mesons (a very small and elusive particle) oscillating between matter and antimatter. Weird, but super cool. This was predicted to occur since the other mesons have already been proven to exhibit this weird behavior. Furthermore, this evidence crosses the "five-sigma" level of statistical certainty that is needed to declare it an actual discovery.
BBC News: http://www.bbc.co.uk/news/science-environment-21594357
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