US Democratic hopefuls debate key policies

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Ten Democratic presidential hopefuls have clashed in a televised debate that laid bare the way the party is battling over how best to win in 2020. The UN Humanitarian chief, Mark Lowcock, tells us about the death toll and damage the Syrian government bombing is causing in the rebel-held province of Idlib. And while carrying out a census of the reindeer population on the Norwegian archipelago of Svalbard, scientists found 200 reindeer bodies. We find out what may have caused this.