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Why two almost-equal notes make a wobble: beats and the piano tuner's trick Play two almost-equal notes together and you hear one pitch that swells and fades. Those swells are beats, and their rate is simply the difference in… Music & Sound4 min read Why a falling ruler slips through your fingers: gravity as a reaction-time stopwatch Drop a ruler without warning and you will not catch it at the top. The place where your fingers close is a stopwatch reading: the distance it fell is ½ g t²… Mind4 min read Why two almost-in-tune notes throb, and how tuners use the wobble Play two notes that are almost in tune and you hear one note that swells and fades: wah-wah-wah. Neither string is wobbling. The throb, called a beat, appears… Music & Sound5 min read