Scientists say they believe they have captured the elusive Higgs Boson particle that gives matter mass.
Professor John Womersley, chief executive of the Science and Technology Facilities Council, told reporters at a London briefing that they had discovered a particle consistent with the Higgs Boson.
Discovery is the important word. That is confirmed. It's a momentous day for science.
There is a strong Welsh connection to the groundbreaking scientific project as Dr Lyn Evans from Aberdare was the project leader.
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Mostly dry with clear spells developing tonight in the north, which will allow some mist and fog patches to form.
It's usually something reserved for the coast, but today the Pro Surf Challenge added a stop at Snowdonia to its tour.
An ambulance crew was attending an emergency call in Newport when they had fireworks thrown at them.