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
pencil-drawing:
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They've even dealt with a blood clot in the neck, treating it with injections of a blood-thinning drug and later oral medicine, once it arrived on a cargo resupply ship.