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So of course there are the usual caveats that the most likely cause is some form of terrestial interference that they haven't yet pinned down but they have been working on it for a while and haven't found any yet:
It's even more interesting given that Proxima Centauri is the closest star to us. If it turned out to be a signal then it would be possible to actually communicate as the signal would take "only" 4.2 years each way. There is also the possibility we could send a micro probe there in under 30 years:
I once went to an astronomy evening and the lady giving the talk asked the question, "What is the closest star to Earth?", one man stood up and replied, "Proxima Centauri"
A little girl of about eight corrected him, "The Sun."