Neil deGrasse Tyson On How Much We Don't Know About Our Universe | The Significance of Mehsud's Death | $1 Billion in Art Seized by Nazis Discovered in Munich

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A growing black hole, called a quasar, can be seen at the center of a faraway galaxy in this artist's concept. NASA telescopes discovered similar quasars hiding in galaxies in the distant universe.
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The Significance of Mehsud's Death | ENDA and the State of the GOP | Neil deGrasse Tyson On How Much We Don't Know About Our Universe | Retro Report: Looking Back on the National Cancer Act | $1 Billion in Art Seized by Nazis Discovered in Munich | Why You Did (Or Didn't) Quit Smoking | Exploring 'The Power of Glamour'