Today's Takeaways: Presidential Polls, Alien Airwaves, Muslim Comedians

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Once radio waves are transmitted from Earth, they travel indefinitely through space.
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July 21, 2015: 1. ISIS Chief Creates Plan to Ensure Group's Survival | 2. Islamic State Attacks Kurds in Turkey | 3. Presumption of Innocence for Sale: Why D.C. Has Done Away With Bail | 4. What Aliens Would Hear if They Intercepted Our Radio Waves | 5. Muslim Comedian Roundtable: Testing the Limits of Islam & Humor