I am the proud owner of a fancy iPod speaker, not dissimilar in looks to a black Lego brick, with a sleek and streamlined exterior and four round buttons on top. It’s lovely. And it works pretty well, except that when it’s plugged in it emits the kind of high-pitched noise that is surely only designed for dogs to hear. Unfortunately for me, my ears are still so youthful that they pick up this particular frequency. Excellent.

Science tells us that there are certain frequencies that the majority of the population simply cannot hear. Maybe you are one of the blessed majority whose...

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