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Teeqoz said:

I remember reading about this exact discovery (by the same people) two years ago

(source)
http://www3.imperial.ac.uk/newsandeventspggrp/imperialcollege/newssummary/news_16-5-2014-15-32-44

Also they didn't "discover" it per se, they just figured out a way to do it, we already knew it was possible.

EDIT: Seems like the article you posted is also in fact about 2 years old, slowpoke

more importantly they did all the theoretical physics math to proof that based on todays knowledge there is a significant chance of photon-photon reactions being detectable through the proposed experimental setup