The narrow wedge of the zodiacal light (left) reaches nearly to the Milky Way (right) on Nov. 1 from near Kenton, Oklahoma. The zodiacal light stands high in the eastern sky this time of year but ...

Department of Biological and Chemical Engineering, Aarhus University, Aarhus C 8000, Denmark ...

It’s effective, but there’s a catch — the mercury vapor lamps that currently illuminate the process gulp energy, soil easily, and come with hefty price tags for maintenance and replacement. “The bulbs ...

The streetlight in front of his house has a sensor that faces westward, and flips the lamp on once the sun has disappeared over the horizon. As it turns out, [Chris’s] third floor window is due ...