Dr Lyn Evans has spoken of his pride that Wales was involved in the discovery of what's believed to be the Higgs Boson particle.
Dr Evans from Aberdare was the project leader for research into Higgs Boson, which gives matter mass and and holds the physical fabric of the universe together.
Scientists have been looking for the Higgs since the 1960s, but the search began in earnest more than 20 years ago with early experiments at Cern in Europe and Fermilab in the US.
More top news
A cold, crisp start to the day with lots of winter sunshine. Cloud will thicken from the west during the afternoon and winds will increase.
Clear skies this evening and overnight will allow for a widespread frost. A cold, crisp and bright start to Friday.
L/Cpl Joshua Leakey, 27, says he is an "average bloke" despite receiving the highest military honour for astonishing bravery in Afghanistan.