For centuries, witnesses have described luminous spheres appearing during or after thunderstorms. The reported objects may hover, drift, pass near buildings and vanish quietly or with a sharp sound, ...

In a remote corner of northwestern Venezuela, the sky rarely goes dark for long. Storm clouds gather nightly above the marshy ...

In certain parts of the U.S., summer nights begin with an unbeatable light show. As dusk settles in, tiny yellow-green beads of light pulse in the darkness: lightning bugs just starting out for the ...