From JLab_News https://twitter.com/JLab_News on Twitter: #BornOnThisDay in 1924, Cesar Lattes discovered the first particle built of two quarks, the pion, with his colleagues in 1947. We produce and study pions (green) and other particles to better understand matter's building blocks! https://twitter.com/JLab_News/status/1017061533342367744/photo/1 https://chirp.cooleysekula.net/attachment/51299