POP QUIZ: Janna Levin is… (a) An astrophysicist (b) An award-winning writer (c) Host of NOVA’s "Black Hole Apocalypse" (d) All of the above 👈 Don’t miss "Black Hole Apocalypse," premiering January 10 at 9/8c on PBS: http://bit.ly/blackholes-janna

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