A smoke alarm isn’t just an annoying interruption when you’re master chef-ing (flambé is
meant to burn things, right?) – they actually do have a pretty vital purpose. They’re compulsory
in every new home, and their number varies depending on how big your house is. To keep your
house standing, and protect those family members you’re mildly fond of, you should replace
smoke alarm batteries regularly – a good rule is to replace them once a year.