On this #DarkMatterDay, learn more about our "dark cosmos" (and the quest to illuminate it) with a good book! May I recommend "Reality in the Shadows" (esp. chapter 7) by Frank Blitzer, @Dr_JimGates , and me and "The 4% Universe" by Richard Panek? https://www.amazon.com/Reality-Shadows-What-Hecks-Higgs/dp/1936411393 https://twitter.com/drsekula/status/1057626506233552896/photo/1 https://chirp.cooleysekula.net/attachment/52411