Boiling water. It sounds so easy, but how do you know when the water is actually at that crucial stage...that is, aside from all those gurgling bubbles. Thanks to this handy boil buoy that chimes when the time is right, you'll never have to wonder again. If you've already mastered the whole bubbling-means-boiling thing, you can still take advantage of the boil buoy's ringing alarm that'll free you from your pot-watching post.
About $10; quirky.com