Financial crises are becoming more frequent as markets and the rules that govern them grow ever more complex. New research suggests that this is no coincidence — and that a simpler system would be a lot more resilient. Forward-thinking officials have long argued that financial regulation needs to be simpler. In his much-quoted speech “The Dog and the Frisbee,” …

  Quantum mechanics, Carl Sagan once observed, is so strange that “common sense is almost useless in approaching it.” Scientists still don’t understand exactly why matter behaves as it does at the quantum level. Yet they’re getting better at exploiting its peculiar dynamics — in ways that may soon upend the technology business. One of the most interesting applications is …

  Brexit pressure is mounting on Theresa May and the British Prime Minister will have to cross the molehills before she hits the mountain ahead. While Japan has warned that its companies might walk out if they don’t get access to the single market in the UK, the US has shown its reluctance to enter into a trade deal with …