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A U.S. Air Force jet performs a test drop of a B61-12 bomb in December 2021. That bomb can contain a nuclear warhead for use in wartime. Los Alamos National Laboratory

What countries have nuclear weapons, and where are they?

Both the Russian and US arsenals boast thousands of nuclear weapons, located in various places around their own countries and, for the US, in Europe as well.
Fire a set of high-power lasers at a tiny speck of hydrogen isotopes and you can initiate nuclear fusion, the process that powers the Sun. National Ignition Facility

How much energy can people create at one time without losing control?

Scientists are working on ways to make lots of energy by converting matter into energy. The trick is keeping the process under control. One possibility is nuclear fusion – the Sun’s power source.

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