High-stakes talks between the US and Iran over the future of Tehran’s nuclear programme ended on Thursday without a deal, as the White House weighs a military operation that would mark its largest intervention in the Middle East in decades.
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The background radiation from cosmic rays increases with altitude, from 0.3 mSv per year for sea-level areas to 1.0 mSv per year for higher-altitude cities, so for best results use this on a plane or in outer space