Majid Takht-Ravanchi, Iran's deputy foreign minister, tells the BBC's Lyse Doucet that the ball was "in America's court to prove that they want to do a deal".
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Clinician Dr Hilary Cass says "people at the extremes" had caused a lot of distress for young people.
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Can boosting testosterone improve libido, or is much of the attention solely hype, profit, and placebo?
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A number of children have been hospitalised as officials urge families to check they are up to date with their vaccines.
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Opposition politicians flocked to a summit in Munich to offer an alternative to America First - and stake a claim as future party leaders.
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