From SMUPhysics https://twitter.com/SMUPhysics on Twitter: Wednesday Oct. 31 is International # for a second year! Watch this space for information about activities you can participate in on Wednesday to celebrate the mystery of dark matter! And check out https://www.darkmatterday.com/ to find events near you! https://twitter.com/SMUPhysics/status/1056971085843963904/photo/1 https://chirp.cooleysekula.net/attachment/52374