From NPR: “In Philadelphia, 30 parks and recreation centers are outfitted with a small speaker called the Mosquito. It blares a constant, high-pitched ringing noise all night long — but one that only teenagers and young adults can hear. Anyone over age 25 is supposed to be immune because, basically, their ear cells have started to die off.” (I don’t need to be able to hear it to know this sounds like a pretty bad idea.)

+ WaPo: They finally built a better ketchup bottle. And soon it’s going to be everywhere. (The bottle, not the ketchup.)