Across the United States, drivers are looking up at intersections and noticing a new, unfamiliar glow: small blue lights ...

Blue lights on skin make it harder to see surface veins. As the “War on Drugs” declared by former President Nixon in the 1970s staggers on, science and governments look for novel ways to combat drug ...

Years ago, if you were to ask a child to draw a police car, you would undoubtedly get a picture of a black and white vehicle—probably a Crown Vic style—with red and blue flashing lights. Today, ...