There's something physicists haven't told you – until now. This week on Science Weekly we have an extract of Sean Carroll's lecture at the Royal Institution entitled The Particle at the End of the Universe in which he reveals that secret. Sean is a theoretical physicist at Caltech in Pasadena, California.
You can watch the whole lecture on YouTube, the Q&A session afterwards, and an interview he gave about what happens next at the Large Hadron Collider.
Also this week, Alok Jha meets astronomy blogger Stuart Clark to discuss last week's announcement of a Nasa/European Space Agency Orion collaboration: a programme of missions beyond low Earth orbit.
Plus, Ryan O'Hare talks to Professor Bob Elwood about his research investigating whether crabs can experience pain.
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