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NATO Secretary-General Mark Rutte is set to hold talks with US President Donald Trump at the White House on Wednesday, aiming to mollify the volatile US leader two weeks before the annual summit of the military alliance and as the Pentagon reviews the size of the US military foot

Across cultures, the way we soothe an unsettled baby tends to look much the same: hold them close and gently rub their back. The act is so familiar that it's easy to forget how little is actually understood about why it works.