From SMUPhysics https://twitter.com/SMUPhysics on Twitter: How do you spot a "Dark Matter Rock"? This picture will help you to know what to look for on campus during the Dark Matter Rock Hunt on Oct. 31, #DarkMatterDay! On your walks across campus on Wednesday, look out for dark matter! https://twitter.com/SMUPhysics/status/1057358772149067776/photo/1 https://chirp.cooleysekula.net/attachment/52389