NASA's Curiosity lands on Mars

NASA's Mars rover Curiosity makes an historic landing on the red planet, ready to search for signs of the key ingredients for life.

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Kerry urges Iran to make 'hard choices', says US ready to walk

VIENNA - An Iranian nuclear agreement is possible this week if Iran makes the "hard choices" necessary, but if not, the United States stands ready to walk away from the negotiations, U.S. Secretary of State John Kerry said on Sunday. | Video