A crystal radio is basically a high Q resonator tied to an antenna and an envelope detector. These days the envelope detector is a point contact diode such as a 1N34 Germanium diode. The resonant ...

Each pair also features saddle-style stitching, crystal lenses, unique textures, and daring colors. The Prancing Horse logo occupies pride of place on the temple, naturally. Conceived and ...

the cornea or the lens internally the crystal lens. You know some aberration within that lens is typically what's causing the halo. The number one reason we see halos is patients have corrective ...

Buying contact lenses online comes with a few key benefits that you don’t get from in-person shopping: It’s more convenient and faster, and the contacts are typically cheaper than buying at ...

The best lenses for astrophotography enable you to capture the stars at the highest quality possible. Our roundup includes models for all leading camera brands. You'll want to own one of the best ...

Crystal Jade in Singapore is offering a complimentary ... We received many great submissions for “The Lens” this year, covering a variety of topics across the globe. “The Lens” is an ...

Stereoscopic 3D glasses that are used with "active 3D" computers and TVs. The glasses use liquid crystal lenses that act as shutters, alternately opening and closing the view to the screen.

Corrections & Clarifications: A previous version of this story described a directional functionality as a Lens feature, but it is not part of that suite of products from Google. NEW YORK ...

The best iPhone lenses are a sure fire way to take your iPhone photography up a level. Sure, the iPhone 15 Pro has a 48MP sensor, which sounds great on paper, right? Well, ask any professional ...

Used for 3D gaming and the first 3D TVs, liquid crystal (LC) shutter glasses are ... In addition, some people notice the lens flicker. THIS DEFINITION IS FOR PERSONAL USE ONLY.

Crystal skulls are not uncommon or terribly mysterious. Thousands are produced every year in Brazil, China, and Germany. But there are a handful of these rather macabre objects that have fueled ...