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Leaders agree it was "highly likely" that Russia was responsible for a nerve agent attack in Salisbury.
EU leaders clear the way for trade and security talks to begin in another step forward in the process.
Academics found calculators can also help students become better at problem solving.
Excess weight now causes 6.3% of all cancer cases - up from 5.5% in 2011, a study suggests.
Prince Harry and fiancée Meghan Markle visit Northern Ireland.