Summary: Supermassive black holes lurk in nearly every galaxy, and stellar-mass black holes are making news with mergers that we see with our gravitational wave observatories. But what about the black hole middle class? And just how massive are these things anyway? Plus, Hollywood director and astroquark brother K.C. Colwell ("The Wolverine", "The Walking Dead") joins the astroquarks to talk about science and special effects in movies. And we honor the 50th anniversary of Apollo 11 with bonus Apollo trivia.
