We’ve all been there. It’s 2 a.m. and you hear an eardrum-piercing beep. Your first reaction is to cover your head with a pillow and pretend it never happened. Eventually the slow chirping takes ...

If you’ve ever swapped the battery in your smoke detector only to find it still chirping at you, you’re not alone. That persistent beep is one of the most frustrating household mysteries, but there’s ...