Smart glass can save fuel, keep vehicles cooler: How it works

A luxury feature that began as a $2,500 option on luxury convertibles just might boost the fuel economy or electric range of your next car.

If making the world a better place through lower emissions and petroleum consumption doesn’t float your boat, could I interest you in never again burning your legs on sunbaked leather upholstery as you hop into a car that’s a cool 72 F compared to 90 after sitting in a summer parking lot?

How? The Suspended Particle Device, which is the Star Trek-like name for a film that turns vehicles’ sun roofs and other glass from transparent to opaque, blocking the infrared and ultraviolet light that superheat interiors and prematurely age leather and other materials.

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