For anyone growing weary of the constant focus on Russian and President Donald Trump's campaign, good news! A fresh horror took the spotlight late last week in the form of WannaCry, a vicious ransomware whose creators appear not to have been all that smart. WannaCry, we learned, features a built-in "kill switch" that security researchers have used to, well, kill it, at least for now. Some people on XP and Windows 7 might even be able to get their files back.