From BrookhavenLab https://twitter.com/BrookhavenLab on Twitter: #OnThisDay in 1999, a particle beam made the first complete lap around one of #RHIC's two accelerator rings. #RHIC20 https://twitter.com/BrookhavenLab/status/1279083240477855746/photo/1 https://chirp.cooleysekula.net/attachment/65882