Your engine needs a constant supply of clean air to run efficiently. The air filter is the guardian that traps dust, pollen, ...

No other warning light in modern life behaves quite like this one. A low battery icon tells you exactly what's wrong and exactly how long you have. A smoke detector screams until someone deals with it ...

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Aaron Tilley is a former reporter covering all things Apple in The Wall Street Journal’s San Francisco bureau. He previously served as the Microsoft and enterprise technology reporter at the Journal.