It hits without warning: a few bites into an ice cream cone or a fast gulp of a slushie, and suddenly there’s a sharp, stabbing pain right behind the forehead. It’s not actually your brain freezing — nothing in your skull gets cold enough for that — but the real explanation is still a fascinating

You know the feeling: pounding head, queasy stomach, a mouth that tastes like the inside of a shoe. A hangover is often treated as a single, mysterious punishment for a fun night, but researchers have actually mapped out several distinct biological processes happening at once — and none of them is simply “too much alcohol”