The last lecture of the Fall 2018 #PHYS1303, "Light and the Dark Cosmos," is now up on YouTube: https://t.co/289QC6GdYI This includes the classroom lecture (80 min.) and the "lost lecture" on dark matter I intended to give but ran out of time. https://twitter.com/drsekula/status/1069622771263655937/photo/1 https://chirp.cooleysekula.net/attachment/53024