Most folks wouldn’t think to toss a glass of table salt into the glove box. Salt belongs in the kitchen, right? That’s what I thought—right up until a police officer leaned into my window on a frozen morning and handed me one of the cheapest, handiest “tools” I’ve ever kept in my car.
It was the kind of cold that makes the air bite. The roads were polished slick, my tires skittered on a side street, and I eased over to collect myself. A patrol car pulled in behind me. The officer checked that I was okay, then glanced at the sheen of ice under my wheels and said, almost conspiratorially, “If you want to save yourself a headache in weather like this, keep a glass of salt in the car. Sounds old-fashioned. It works.”


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