From Twitter https://twitter.com/: 1912: a discovery of cosmic proportions: https://t.co/xIbVJ0m9J9 #TBT Happy International #CosmicDay! https://home.cern/students-educators/updates/2017/11/happy-international-cosmic-day https://twitter.com/CERN/status/936229782601256960/photo/1 https://chirp.cooleysekula.net/attachment/44330