SAN FRANCISCO — Last Saturday, after a three-mile hike through the Presidio, I stood in a throng of tourists looking at the Golden Gate Bridge. As the crowd snapped photos of the landmark, I decided to join in.
But instead of reaching into my pocket for my iPhone, I tapped the side of my Ray-Ban sunglasses until I heard the click of a shutter. Later, I downloaded the photos that my sunglasses had just taken to my phone.
The process was instant, simple, unobtrusive — and it was powered by…
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