Doomsday Clock stays at 90 seconds to midnight

Despite decades of arms control agreements there are still about 13,000 nuclear warheads globally, 90% of them Russian and American. Six other countries are declared nuclear powers: the UK, France, China, India, Pakistan and North Korea. Israel is widely believed to have these weapons, but has never confirmed it. Most modern nuclear weapons are many times more powerful than those that destroyed Hiroshima and Nagasaki.