Today's Takeaways: A Mission to Mars, 'Unthinkable' Violence, Mass Extinction

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HI-SEAS scientist Anne Caraccio on the team's "mission" to "Mars."
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June 24, 2015: Obama Orders Change in U.S. Hostage Policy | 2. Stop Saying Mass Shootings Are 'Unthinkable' | 3. The Confederate Flag & A History of Toxic Symbols | 4. Six Scientists Return from 'Mars'