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The California Senator, Kamala Harris, has put in a strong performance in the second of two Democratic Party presidential debates in the United States. She attacked the frontrunner, Joe Biden, over his actions during the civil rights movement in the 1970s. One of the world’s top health officials speaks out on the Ebola crisis in the Democratic Republic of Congo, after visiting communities affected by the outbreak. Twitter is to introduce new rules for the tweets of politicians and other important sources that it says will strike a better balance between free speech and accountability.