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We've had the chance to sample Mercedes-Benz's so-called Magic Sky Control technology in both the SL and SLK roadsters, and it's a pretty clever party trick. The technology can turn the overhead roof panel in either of the two-seaters from transparent to opaque by energizing the light-blocking crystals sandwiched in the glass. By electrifying the crystals, they reorder themselves, varying the amount of light that's let through the glass roof panel.

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