There are about 13,885 nuclear weapons in the world. Here's an overview of the world's nuclear states and their arsenal.
Three NATO officials said that Trump's recent suggestion that Russia should rejoin the G7 has hampered NATO's ability to take a hard line with Putin.
A popular Reddit thread about an "atomic cigarette lighter" seems true. In 1952, the physicist Ted Taylor used a nuclear blast to ignite his smoke.
Some experts say Trump is ramping up tensions with Iran to squeezing them into capitulation, a high-risk strategy that shows little signs of working.