An anonymous reader writes "The Higgs boson is regarded as the key to understanding the universe. Physicists say its job is to give the particles that make up atoms their mass. Without this mass, these particles would zip though the cosmos at the speed of light, unable to bind together to form the atoms that make up everything in the universe, from planets to people. From the article: 'Five leading theoretical physicists have been invited to the event on Wednesday - sparking speculation that the particle has been discovered. Scientists at the Large Hadron Collider are expected to say they are 99.99 per cent certain it has been found - which is known as 'four sigma' level. Peter Higgs, the Edinburgh University emeritus professor of physics that the particle is named after, is among those who have been called to the press conference in Switzerland."