From particlenews https://twitter.com/particlenews on Twitter: Dark Matter Day has returned! This October 31, celebrate the hunt for the elusive substance that, along with dark energy, makes up 95 percent of the mass and energy in our universe! https://www.interactions.org/press-release/celebrate-dark-matter-halloween-dark-matter-day-return https://twitter.com/particlenews/status/1049661367307984900/photo/1 https://chirp.cooleysekula.net/attachment/52242