Science Weekly Extra podcast: Higgs boson special

The Guardian's science correspondent, Ian Sample, reports from Cern in Switzerland as scientists working on the Large Hadron Collider announce they have conclusive evidence of a new fundamental particle that may be the Higgs boson. Ian speaks to the Cern director general, Rolf-Dieter Heuer, and to Welsh scientist Lyn Evans, who played a key role in the LHC's construction and design. Also, we delve into the archive and present an insightful and detailed discussion about the Higgs boson with Prof Jon Butterworth who is part of the Atlas team at Cern and central to this week's historic announcement.