Prelude : CERN, April 2008 -- What is everything made of? -- Detecting subatomic particles -- Group theory and gauge invariance -- Looking for something new at the LHC -- The Higgs particle/field and weak interactions -- Data that go bump in the night -- Trying to identify the 125 GeV bump -- Electroweak gauge theories -- The discovery of a new boson : is it the Higgs or not? -- Do we live in a naturally tuned universe? -- The last word until 2016 -- Glossary.