James Gallagher, health editor
More than two billion people live in parts of the world where the Zika virus can spread, detailed maps published in the journal eLife show.
The Zika virus, which is spread by Aedes aegypti mosquitoes, triggered a global health emergency this year.
A train carrying half a million litres of water has been dispatched to the worst-affected areas of India's drought-hit western Maharashtra state.
The "water train" is pulling 10 tankers filled with water to Latur district.
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A mobile insurance scheme to help small-scale farmers in Kenya insure their agricultural produce against drought and other natural disasters is spreading to other parts of Africa, as Neil Ford explains.
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By Nafiseh Kohnavard
It is the smell that you notice first of all - a bitter mixture of egg and cucumber that hangs in the air, and burns your nose and throat. Local people say they have been washing down the streets and cleaning their houses constantly, but it will not go away.
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By James Longman
BBC Victoria Derbyshire programme
The number of children who have died fighting for so-called Islamic State (IS) in the last year is nearly twice the previous estimate, a report says.
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