From CERN https://twitter.com/CERN on Twitter: To educators: play with quark #puzzle pieces and learn more about the rules that govern these particle systems on the CERN #SCoolLAB website: https://scoollab.web.cern.ch/quark-puzzle https://twitter.com/CERN/status/1247984013639327751/photo/1 https://chirp.cooleysekula.net/attachment/64489