Janna Levin TED talk

I've been reading Black Hole Blues by Janna Levin which is the story of the LIGO experiment to discover gravitational waves. She's done a good TED talk explaining the idea of how colliding black holes can make space ring - although it was clearly done before the major discovery was announced. https://www.ted.com/talks/janna_levin_the_sound_the_universe_makes