Start the Week - The Spirit of Christmas: Claire Tomalin, Susan Hill and Canon Giles Fraser

Andrew Marr discusses the idea of Christmas with Canon Giles Fraser who argues that the Christian Christmas was invented by the Emperor Constantine for political, not religious, reasons, 300 years after the birth of Christ. Canon Fraser will be discussing the idea that the legacy of Constantine's December feast distorts the message of Christ and casts a long shadow on modern believers. Clare Tomalin will be talking about Dickens and how the Victorian imagination shaped our understanding of what Christmas is and should be, and Susan Hill will be exploring the Christmas ghost story - one of the tenacious Victorian traditions still being reinvented in the 21st century.

Producer: Eleanor Garland.

More or Less: Behind the Stats - Higgs boson statistics

In the week scientists at the Large Hadron Collider announced that the most coveted prize in particle physics - the Higgs boson - may have been found, Tim Harford hears that the statistical significance is being mis-reported. Plus, the difficulties of cornering a market (especially when the commodity is a 1980s plastic doll). And, Tim Harford talks to author Keith Devlin about how Fibonacci revolutionised trade by introducing medieval businessmen to simple arithmetic.