This is the Fresnel lens, not one lens really, but numerous tiers of prisms. Lenses like this one turned simple flames into beams upon which sea captains could take their bearings, avoiding risk ...

From reproductive rights to climate change to Big Tech, The Independent is on the ground when the story is developing. Whether it's investigating the financials of Elon Musk's pro-Trump PAC or ...

Naval aviators know that traffic light as the Improved Fresnel Lens Optical Landing System. A pilot uses IFLOLS to discern his glide slope—the angle at which aircraft descend and land—by ...

The seemingly impossible sight was down to the Humphrey brothers’ homemade levees, a tactic they have used before to ride out floods, and which they learned from their late father. The farming ...

At close: April 17 at 4:00:00 PM EDT ...

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