Paris, France's capital, displays why it is known as the "City of Lights" in this photo taken from on board the International ...

Though still only in the prototype stage, this flat lens could one day be used on space telescopes, and perhaps even on ...

People living near Land's End have been advised to buy earplugs due to a lighthouse's on-the-blink ... the horn had been sounding "all day, all night" and "a set of ear plugs might be a good ...

"I think for a light that has a range of up to 27 miles and is constantly lit at night, that's pretty good value." She said that the lens sits in a "pure form of mercury... [that] does not ...

The problem is that in those days, a lighthouse was an oil lamp, a concave mirror, and an ordinary lens. This made the lighthouses difficult to spot. Napoleon started the Commission of Lighthouses ...