One more thing to worry about
August 18, 2013 11:41 AM Subscribe
Scientists first discovered invisible gamma-ray flashes in Earth's atmosphere in 1991. This year, the radiation burst, known as dark lightning, was discovered to be linked to regular lightning flashes. Will you get zapped by dark lightning when flying through a thunder cloud? A single burst can give an airline passenger a lifetime's safe dose of ionizing radiation. But it is rare enough that, for now, the risk is thought to be minimal. The US Naval Research Laboratory is rigging balloons and aircraft to further study the radiation burst threat.
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