The High-Tech Way to Avoid Long Lines

Sometimes a five-minute coffee run can turn into a frustrating half-hour wait, depending on how many caffeine cravers are in line ahead of you. But what if you could know how crowded a place is before heading out for a latte, or a trip to the DMV, or even waiting in a hideously massive line at Trader Joe’s? That’s the concept behind Density, a new device that detects foot traffic in real time.

Here’s how it works: Businesses place Density—which comes in the form of a tiny black...

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