Race to the White House: Democratic hopefuls take to the stage
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This week we head to the United States, where Hillary Clinton comes out on top in the first Democratic presidential debate, but the shadow of Vice President Joe Biden possibly throwing his hat into the ring has yet to go away.
Also, in Guatemala, pollution is now threatening one of the most stunning lakes in the world, and the thousands who depend on it to survive.
Finally, we take you into space, with NASA releasing thousands of never-before-seen photos of the Apollo missions to the moon.