Is the world back to testing nuclear weapons? Here are the facts

The testing of nuclear weapons is suddenly a major topic of discussion after being largely dormant for three decades. Last week, Russia tested a nuclear-powered missile, but did not detonate an actual bomb. In response, President Donald Trump said this week the U.S. will resume testing nuclear weapons .

So far in the 21st century, the only country to have conducted nuclear weapons tests is North Korea, and those tests have all been underground. The U.S. last tested a nuclear bomb in 1992. Russia’s last test was in 1990. China stopped in 1996.

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The most spectacular nuclear tests were those conducted in the open air in the late 1940s and 1950s, producing some of the most iconic and horrifying images of the nucle