Well wow! Who knew particle physics could be so exciting?
For a few minutes this morning things got very tense here in the main control room at Cern, but in the end it's gone better than anyone could have hoped.
As I write the first beam of protons is circulating around the entire 27 kilometre ring of the LHC - something that was expected to take all day. Things have gone so well in fact that the operations team are talking about getting a second beam going the other way around.
And all about me hundreds of very excited physicists are smiling broadly and congratulating each other with the kind of bravado that tells you it was no sure thing.
One of the main topics of conversation seems to be who's house the beam is currently running under. Francois Grey won that debate when he reported that his wife had rung to say the dog started to bark at the ground the moment the beam shot by.
Of course this is just the start of the process, and there's still plenty of physics to come. But for now everyone at Cern is just basking in the moment. And after 30 years why not?