From CERN https://twitter.com/CERN on Twitter: Winners of #BL4S 2018 observing particle tracks in a cloud chamber. Have you ever seen traces of the smallest constituents of matter? Take part and apply before 31 March: http://beamlineforschools.cern/ https://twitter.com/CERN/status/1090964377212280834/photo/1 https://chirp.cooleysekula.net/attachment/54257