Just seen at CERN:  A door with so many signs that you need a PhD to open it

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![One can never have enough signs](https://pbs.twimg.com/media/DWfhLlyWsAA89Ii.jpg)
_One can never have enough signs?!? source: [@freyablekman on twitter](https://twitter.com/freyablekman)_
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Today I spent most of the day showing [50 amateur astronomers from the Belgian town of Genk](http://www.vvs.be/afdelingen/vendelinus-genk) around CERN, you can see them exploring an exhibition copy of the LHC magnets in the photo:

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![CERN visitors around an LHC dipole magnet](https://pbs.twimg.com/media/DWfuRYTXUAAZNPt.jpg)
_Amateur astronomers from Genk visiting one of the LHC dipole magnets on display at CERN. source: [@freyablekman on twitter](https://twitter.com/freyablekman)_
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Besides frolicking around magnets, they already had the chance to see some of the CERN site under my guidance, including the [LEIR (Low Energy Ion Ring) ](https://home.cern/about/accelerators/low-energy-ion-ring) which is now a pre-accelerator for the Large Hadron Collider but used to be the place where the first antimatter atoms were made at CERN in the 1990s. For historical context, this is an amazing historic machine and has the big advantage that you can see it all at once as it is only 15 by 15 meters or so.

Tomorrow we will visit the CMS detector, although I have seen it regularly I still get excited every time I get to see CMS :) Expect some photos!