the news The next What If? video, "If all humans died, when would the last light go out?" is up on YouTube now! Pressure Cooker Am I right to be afraid of pressure cookers? What's the worst thing that can happen if you misuse a pressure cooker in an ordinary kitchen? —Delphine Lourtau The worst thing? Pressure cookers are dangerous. They can explode, in a sense, but not as violently as you might f