The Disasters Emergency Committee has launched a new video to appeal for donations to help the victims of a devastating war in Syria.
More than 5,000,000 people are in urgent need of humanitarian help and half of those are children, it says.
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Nabi Tajima, who was the last known person to have been born in the 19th century, died in Japan after being in hospital since January.
Temperatures are predicted to reach a high of 23C.
Hunt accused companies of "turning a blind eye" to a generation of children "exposed to harmful emotional side effects" of social media.