Did you know dark matter accounts for 85 percent of our gravity? Neil deGrasse Tyson, host of StarTalk Radio, illuminates us on black holes that may lead to other universes, and the common mysteries of dark matter and energy that have a huge hand to play in the way our own universe works. If you like this track (and want more of an explanation and context for Neil’s use of the word “Rebecca”), be sure to check out the whole “Through the Wormhole” episode where Neil interviews Morgan Freeman at http://www.startalkradio.net/show/through-the-wormhole/.